Biology I Final Exam (Practice)
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Characteristics of life include all BUT
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A. growth and development
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B. reproduction
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C. energy use
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D. mimicry
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I took all of the questions from past quizzes in Biology and compiled them all onto one test. Hopefully this will help prepare for the final exam. This does not include the open discussion quizzes that was on the exam.
Quiz Preview
- 2.
How many electrons is required for an element to be stable, in essence non-reactive
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A. six
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B. seven
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C. eight
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D. nine
Correct Answer
A. C. eightExplanation
The answer is C. eight. This is because elements strive to have a full outer electron shell, which typically consists of eight electrons. When an element has a full outer shell, it is stable and less likely to react with other elements. This is known as the octet rule. Therefore, eight electrons are required for an element to be stable and non-reactive.Rate this question:
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- 3.
Charles Darwin proposed the theory of evolution by the mechanism of ____________.
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A. mimicry
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B. natural selection
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C. adaptations
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D. discovery
Correct Answer
A. B. natural selectionExplanation
Charles Darwin proposed the theory of evolution by the mechanism of natural selection. This theory states that individuals with favorable traits are more likely to survive and reproduce, passing on those traits to future generations. Over time, this process leads to the gradual change and adaptation of species to their environment. Natural selection is a key mechanism in Darwin's theory of evolution and is supported by extensive evidence from various fields of study.Rate this question:
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- 4.
Factors that affectenzymatic reactions and their speed include
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A. temperature and pH
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B. inhibitors
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C. amounts of substrate and enzyme
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D. all of the above
Correct Answer
A. D. all of the aboveExplanation
The correct answer is D. all of the above. Enzymatic reactions are affected by temperature and pH because enzymes have an optimal temperature and pH range at which they function most efficiently. Inhibitors can also affect enzymatic reactions by binding to the enzyme and preventing it from carrying out its normal function. The amounts of substrate and enzyme also play a role in the speed of enzymatic reactions. If there is an excess of substrate or enzyme, the reaction may proceed faster, while a limited amount of either can slow down the reaction. Therefore, all of these factors can affect enzymatic reactions and their speed.Rate this question:
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- 5.
Which organelle is responsiblefor the production of energy for our cells?
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A. ribosomes
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B. mitochondria
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C. vacuoles
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D. chloroplasts
Correct Answer
A. B. mitochondriaExplanation
Mitochondria are responsible for the production of energy for our cells. They are often referred to as the "powerhouses" of the cell because they generate adenosine triphosphate (ATP), which is the main source of energy for cellular processes. Mitochondria have their own DNA and are able to produce their own proteins, allowing them to carry out the process of cellular respiration and produce ATP through oxidative phosphorylation. This energy production is essential for the functioning of our cells and overall organism.Rate this question:
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- 6.
Covalent bonding is described as
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A. sharing of electrons
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B. sharing of protons
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C. loss or gain of electrons
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D.loss or gain of neutrons
Correct Answer
A. A. sharing of electronsExplanation
Covalent bonding is a type of chemical bonding where atoms share electrons. This sharing of electrons allows both atoms to achieve a stable electron configuration, resulting in a more stable molecule. In covalent bonding, neither atom completely loses or gains electrons, but rather they share them in order to fill their outermost electron shells. This type of bonding is typically found between nonmetal atoms.Rate this question:
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- 7.
Which of the following processes result(s) from the presence of proteins in or on the plasma membrane?
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A. enzymatic activity
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B. cell-cell recognition
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C. active transport
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D. cell-cell communication
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E. all of the above
Correct Answer
A. E. all of the aboveExplanation
Proteins play a crucial role in various processes in or on the plasma membrane. They can act as enzymes, catalyzing biochemical reactions and facilitating metabolic processes (A. enzymatic activity). Proteins also contribute to cell-cell recognition, allowing cells to identify and interact with each other (B. cell-cell recognition). Additionally, proteins are involved in active transport, which is the movement of molecules across the membrane against their concentration gradient (C. active transport). Lastly, proteins are essential for cell-cell communication, enabling cells to send and receive signals (D. cell-cell communication). Therefore, all of the mentioned processes result from the presence of proteins in or on the plasma membrane (E. all of the above).Rate this question:
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- 8.
A nucleotide consists of
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A. double helix
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B. a sugar, a nitrogenous base, and a phosphate group
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C. only carbon and hydrogen atoms
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D. only within DNA
Correct Answer
A. B. a sugar, a nitrogenous base, and a phosphate groupExplanation
A nucleotide is a building block of nucleic acids, such as DNA and RNA. It consists of three main components: a sugar molecule (either deoxyribose or ribose), a nitrogenous base (adenine, thymine, cytosine, guanine, or uracil), and a phosphate group. These components are joined together to form a nucleotide, which then combine with other nucleotides to form the DNA or RNA molecule. Therefore, option B is the correct answer as it accurately describes the composition of a nucleotide.Rate this question:
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- 9.
Types of RNA include all BUT
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A. messenger
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B. nuclear
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C. transfer
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D. ribosomal
Correct Answer
A. B. nuclearExplanation
The types of RNA mentioned in the options are messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These three types of RNA are involved in different stages of protein synthesis. Messenger RNA carries the genetic information from DNA to the ribosomes, transfer RNA brings amino acids to the ribosomes during translation, and ribosomal RNA forms the structural and catalytic components of ribosomes. Therefore, the correct answer is B. nuclear, as there is no specific type of RNA called "nuclear RNA" mentioned in the options.Rate this question:
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- 10.
Organic compounds are categorized into four classes including all EXCEPT
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A. water
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B. lipids
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C. proteins
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D. nucleic acids
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E. carbohydrates
Correct Answer
A. A. waterExplanation
Organic compounds are compounds that contain carbon atoms bonded to hydrogen atoms. They are classified into four main classes: lipids, proteins, nucleic acids, and carbohydrates. Water, however, is not considered an organic compound because it does not contain carbon atoms bonded to hydrogen atoms. Therefore, the correct answer is A. water.Rate this question:
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- 11.
The reactants in an enzymatic reaction are called the substrates for that enzyme.
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True
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False
Correct Answer
A. TrueExplanation
In an enzymatic reaction, the reactants are referred to as substrates because they are the molecules that the enzyme acts upon. Enzymes are proteins that catalyze chemical reactions by binding to specific substrates and facilitating their conversion into products. The substrates bind to the active site of the enzyme, where the reaction takes place. Therefore, it is correct to say that the reactants in an enzymatic reaction are called the substrates for that enzyme.Rate this question:
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- 12.
Which molecule is considered to the energy currency of cells?
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A. glucose
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B. oxygen
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C. proteins
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D. ATP
Correct Answer
A. D. ATPExplanation
ATP (adenosine triphosphate) is considered the energy currency of cells because it is the molecule that carries and provides energy for cellular processes. When ATP is hydrolyzed, it releases energy that can be used by cells to perform various functions such as muscle contraction, active transport, and synthesis of macromolecules. Glucose is a source of energy, but it needs to be broken down into ATP before it can be used. Oxygen is involved in cellular respiration but is not the actual energy currency. Proteins are essential for various cellular functions but do not directly serve as the energy currency.Rate this question:
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- 13.
Which association is NOT correct?
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A. nucleic acid - RNA or DNA
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B. carbohydrates - enzymes
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C. fats - long term storage of energy
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D. proteins - structures
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E. cellulose - plant cell wall
Correct Answer
A. B. carbohydrates - enzymesExplanation
Carbohydrates are not directly associated with enzymes. Carbohydrates are a type of macromolecule that serve as a source of energy and provide structural support, while enzymes are proteins that act as catalysts in biochemical reactions. Although enzymes can interact with carbohydrates in certain reactions, the association between carbohydrates and enzymes is not a direct one.Rate this question:
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- 14.
A nucleotide of DNA consists of all BUT
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A. five carbon deoxyribose sugar
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B. a nitrogenous base
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C. a phosphate group
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D. a six carbon glucose sugar
Correct Answer
A. D. a six carbon glucose sugarExplanation
The correct answer is D. a six carbon glucose sugar. This is because a nucleotide of DNA consists of a five carbon deoxyribose sugar, a nitrogenous base, and a phosphate group. Glucose is a different type of sugar and is not found in DNA nucleotides.Rate this question:
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- 15.
Which sequence correctly lists the different levels of biological organization?
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A. cells -> organs -> tissues -> organ system -> organism
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B. cells -> tissues -> organ system -> organs -> organism
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C. tissues -> cells -> organ -> organ system -> organism
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D. tissues -> organs -> organ system -> organisms -> cells
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E. cells -> tissues -> organs -> organ system -> organism
Correct Answer
A. E. cells -> tissues -> organs -> organ system -> organismExplanation
The correct answer is E. This sequence correctly lists the different levels of biological organization, starting from the smallest unit (cells) and progressing to larger structures (tissues, organs, organ systems, and finally the whole organism). This sequence follows the hierarchical organization of living organisms, where cells combine to form tissues, tissues combine to form organs, organs work together to form organ systems, and all of these components come together to form a complete organism.Rate this question:
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- 16.
As air temperaturewarms duringthe day from 50 to 70 degrees, water in the same area will
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A. warm the same as air
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B. warm more quickly than air
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C. warm more slowly
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D. not change at all in temperature
Correct Answer
A. C. warm more slowlyExplanation
As air temperature warms during the day from 50 to 70 degrees, water in the same area will warm more slowly. This is because water has a higher specific heat capacity compared to air. Specific heat capacity is the amount of heat energy required to raise the temperature of a substance by a certain amount. Since water has a higher specific heat capacity, it requires more heat energy to raise its temperature compared to air. Therefore, the water will warm at a slower rate than the air.Rate this question:
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- 17.
White blood cells engulf bacteria through what process
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A. exocytosis
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B. phagocytosis
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C. pinocytosis
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D. osmosis
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E. receptor-mediated exocytosis
Correct Answer
A. B. phagocytosisExplanation
Phagocytosis is the process by which white blood cells engulf and ingest bacteria. This process involves the formation of pseudopodia, which surround and engulf the bacteria, forming a phagosome. The phagosome then fuses with lysosomes, forming a phagolysosome, where the bacteria are broken down and destroyed. This is an important mechanism of the immune system to eliminate harmful bacteria and other pathogens from the body.Rate this question:
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- 18.
Different alleles in a given pair are described as _________.
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A. genotype
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B. heterozygous
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C. phenotype
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D. homozygous
Correct Answer
A. B. heterozygousExplanation
Different alleles in a given pair are described as heterozygous. Heterozygous refers to having two different alleles for a particular trait. In this case, the individual has two different versions of the gene in the pair, one from each parent. This is in contrast to homozygous, where the individual has two identical alleles for the trait. Genotype refers to the genetic makeup of an individual, while phenotype refers to the physical expression of the genotype.Rate this question:
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- 19.
The atomic weight of an element is calculated by
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A. number of protons
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B. number of neutrons
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C. number of protons + neutrons
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D. number of protons + electrons
Correct Answer
A. C. number of protons + neutronsExplanation
The atomic weight of an element is calculated by adding the number of protons and neutrons in the nucleus of an atom. Protons have a positive charge and neutrons have no charge, therefore their combined number represents the mass of the atom. Electrons, on the other hand, have a negligible mass compared to protons and neutrons, so they are not included in the calculation of atomic weight. Therefore, the correct answer is C. number of protons + neutrons.Rate this question:
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- 20.
The sum of all chemical reactions occurring inside a living cell is called
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A. metabolism
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B. synthesis
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C.thermodynamics
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D. hydrolysis
Correct Answer
A. A. metabolismExplanation
Metabolism refers to the sum of all chemical reactions that take place within a living cell. These reactions include both catabolic reactions, which break down molecules to release energy, and anabolic reactions, which build up molecules using energy. Therefore, metabolism encompasses all the processes involved in converting food into energy, synthesizing new molecules, and maintaining the overall functioning of the cell.Rate this question:
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- 21.
When a disease is said to have a multifactorial basis, it means that
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A. both genetic and environmental factors contribute to the disease
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B. it is caused by a gene with a large number of alleles
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C. it affects a large number of people
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D. it has many different symptoms
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E. it tends to skip a generation
Correct Answer
A. A. both genetic and environmental factors contribute to the diseaseExplanation
When a disease is said to have a multifactorial basis, it means that both genetic and environmental factors contribute to the disease. This suggests that the disease is not solely caused by genetic factors or environmental factors alone, but rather a combination of both. This understanding is important in determining the risk factors, prevention strategies, and treatment options for the disease.Rate this question:
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- 22.
What is the only evolutionary mechanism that consistently leads to adaptive evolution?
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A. neutral variation
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B. gene flow
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C. natural selection
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D. the bottleneck effect
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E. genetic Drift
Correct Answer
A. C. natural selectionExplanation
Natural selection is the only evolutionary mechanism that consistently leads to adaptive evolution. This process involves the differential survival and reproduction of individuals with favorable traits, leading to the accumulation of advantageous genetic variations in a population over time. Through natural selection, individuals with traits that enhance their ability to survive and reproduce in a given environment are more likely to pass on their genes to the next generation. This results in the gradual adaptation of a population to its environment, as individuals with beneficial traits become more prevalent.Rate this question:
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- 23.
Which term describes centromeres uncoupling, sister chromatids separating, and the two new chromosomes moving to opposite poles of the cell?
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A. telophase
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B. anaphase
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C. prometaphase
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D. metaphase
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E. prophase
Correct Answer
A. B. anaphaseExplanation
Anaphase is the correct answer because it is the phase of mitosis where the sister chromatids separate and move to opposite poles of the cell. During anaphase, the centromeres uncouple and the two new chromosomes are pulled apart by the spindle fibers towards the opposite ends of the cell. This is a crucial step in cell division as it ensures that each daughter cell receives a complete set of chromosomes.Rate this question:
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- 24.
In a pedigree chart, vertical lines represent
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A. offspring
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B. filial (F1) generation
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C. mating
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D. affected members
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E. diseases
Correct Answer
A. A. offspringExplanation
Vertical lines in a pedigree chart represent offspring. This is because the vertical lines connect the parents to their children, showing the lineage and the generations in the family tree. The offspring are the direct descendants of the parents, and the vertical lines indicate the continuation of the family line through the generations.Rate this question:
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- 25.
Ose is a common suffix with which type of compounds?
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A. sugars
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B. steroids
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C. proteins
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D. acids and bases
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E. nucleic acids
Correct Answer
A. A. sugarsExplanation
The suffix "ose" is commonly found in the names of sugars. This suffix is used to indicate that a compound is a sugar, such as glucose, fructose, and sucrose. Therefore, option A is the correct answer.Rate this question:
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- 26.
Which of thefollowing is (are) true about facilitated diffusion?
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A. requires a concentration gradient
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B. requires a membrane
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C. involves proteins
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D. doesn't involve an outside energy source
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E.all of the above
Correct Answer
A. E.all of the aboveExplanation
Facilitated diffusion is a passive transport process that allows the movement of specific molecules across a cell membrane with the help of transport proteins. The given answer, "E. all of the above," is correct because facilitated diffusion requires a concentration gradient, a membrane through which the molecules can pass, involves proteins (specifically transport proteins), and does not require an outside energy source. Therefore, all of the statements mentioned in options A, B, C, and D are true about facilitated diffusion.Rate this question:
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- 27.
Which of the following DOES NOT apply to carbohydrates?
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A. may be monsaccharides, disaccharides, or polysaccharides
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B. complex include starches and glycogen
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C. may be saturated or unsaturated
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D. composed of carbon, hydrogen, and oxygen atoms
Correct Answer
A. C. may be saturated or unsaturatedExplanation
Carbohydrates are organic compounds composed of carbon, hydrogen, and oxygen atoms. They can be classified into three main types: monosaccharides, disaccharides, and polysaccharides. Complex carbohydrates include starches and glycogen. However, the concept of saturation or unsaturation is not applicable to carbohydrates. This property is typically associated with fats and oils, which are composed of different types of fatty acids. Therefore, option C does not apply to carbohydrates.Rate this question:
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- 28.
Types of passive transport include all BUT
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A. diffusion
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B. facilitated diffusion
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C. receptor-mediated
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D. osmosis
Correct Answer
A. C. receptor-mediatedExplanation
Passive transport is a process in which substances move across a cell membrane without the use of energy. Diffusion, facilitated diffusion, and osmosis are all examples of passive transport. Diffusion is the movement of molecules from an area of high concentration to an area of low concentration. Facilitated diffusion is the movement of molecules across the membrane with the help of transport proteins. Osmosis is the movement of water molecules across a selectively permeable membrane. Receptor-mediated transport, on the other hand, involves the binding of a substance to a specific receptor on the cell membrane, which then triggers the transport of the substance into the cell. Therefore, receptor-mediated transport is not a type of passive transport.Rate this question:
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- 29.
Across between homozygous purple-flowered and homozygous white-flowered pea plants result in offspring with pruple flowers. This demonstrates
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A. the blending model of genetics
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B. true-breeding
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C. dominance
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D. a dihybrid cross
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E. the mistakes made by Mendel
Correct Answer
A. C. dominanceExplanation
This answer is correct because the statement describes a situation where the offspring of homozygous purple-flowered and homozygous white-flowered pea plants have purple flowers. This indicates that the purple flower trait is dominant over the white flower trait, supporting the concept of dominance in genetics.Rate this question:
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- 30.
Domains or "superkingdoms" include all BUT
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A. Bacteria
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B. Archaea
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C. Eukarya
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D. Animalia
Correct Answer
A. D. AnimaliaExplanation
The question is asking which option is NOT included in the domains or "superkingdoms." The domains include Bacteria, Archaea, and Eukarya. Animalia, which refers to the kingdom of animals, is not a domain or "superkingdom" and is therefore not included.Rate this question:
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- 31.
Appropriate descriptions for a plasma mebrane include all BUT
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A. fluid
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B. rigid
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C. mosiac
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D. selectively permeable
Correct Answer
A. B. rigidExplanation
The plasma membrane is a flexible and dynamic structure that surrounds the cell. It is composed of a phospholipid bilayer that allows for fluid movement of molecules. The term "mosaic" refers to the presence of various proteins and lipids embedded in the membrane, giving it a mosaic-like appearance. Lastly, the plasma membrane is selectively permeable, meaning it regulates the passage of substances in and out of the cell. However, it is not rigid, as it needs to be flexible to accommodate cellular processes such as endocytosis and cell movement.Rate this question:
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- 32.
Modes of selection include all BUT
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A. connecting
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B. disruptive
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C. directional
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D. stabilizing
Correct Answer
A. A. connectingExplanation
The given question asks for the mode of selection that is not included in the options provided. The options include disruptive, directional, and stabilizing. These are all modes of selection that can occur in evolutionary processes. However, connecting is not a recognized mode of selection in evolutionary biology. Therefore, option A is the correct answer.Rate this question:
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- 33.
An isotonic solution means that the solute concentraion outside the cell is
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A. is the same as inside the cell
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B. is less than inside the cell
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C. is greater than inside the cell
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D. has no effect on the cell
Correct Answer
A. A. is the same as inside the cellExplanation
An isotonic solution refers to a solution where the solute concentration is the same inside and outside the cell. In this scenario, there is no net movement of water across the cell membrane, as the concentration of solutes is balanced on both sides. This allows the cell to maintain its shape and normal functions without any water loss or gain.Rate this question:
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- 34.
Features of the element, carbon, include all BUT
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A. forms covalent bonds
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B. has 4 electrons in its outer shell (valence)
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C. along with hydrogen, included in all organics
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D. forms ionic bonds
Correct Answer
A. D. forms ionic bondsExplanation
Carbon is known for its ability to form covalent bonds, meaning it shares electrons with other atoms. It has 4 electrons in its outer shell, making it versatile for bonding. Additionally, carbon is a key component of organic compounds, along with hydrogen. However, carbon does not typically form ionic bonds, where electrons are transferred between atoms. This is because carbon's electronegativity is not high enough to attract electrons strongly enough for ionic bonding.Rate this question:
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- 35.
In a nucleosome, the DNA is wrapped around
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A. polymerase molecules
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B. ribosomes
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C. histones
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D. a thymine dimer
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E. satellite DNA
Correct Answer
A. C. histonesExplanation
In a nucleosome, the DNA is wrapped around histones. Histones are proteins that help in organizing and compacting the DNA molecule. They act as spools around which the DNA is wound, forming a structure called chromatin. This packaging of DNA with histones allows for efficient storage and regulation of genetic information.Rate this question:
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- 36.
A codon consists of _____ bases and specifies which ______ will be inserted into the polypeptide chain.
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A. 3; nucleotide
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B. 2; nucleotide
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C. 4; fatty acid
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D. 4; fatty acid
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E. 3; amino acid
Correct Answer
A. E. 3; amino acidExplanation
A codon consists of three bases and specifies which amino acid will be inserted into the polypeptide chain. Each codon is a sequence of three nucleotides that corresponds to a specific amino acid. Therefore, the correct answer is E. 3; amino acid.Rate this question:
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- 37.
When a few individuals become isolated from a larger population...
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A. gene flow
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B. founder effect
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C. relative fitness
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D. natural selection
Correct Answer
A. B. founder effectExplanation
The founder effect occurs when a small group of individuals becomes isolated from a larger population and establishes a new population. This small group carries only a fraction of the genetic diversity of the original population, resulting in a limited gene pool. Over time, this can lead to the accumulation of unique genetic traits in the new population, as well as an increased likelihood of genetic disorders. Therefore, the founder effect is the most appropriate explanation for the given scenario.Rate this question:
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- 38.
Lipids include all BUT
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A. phospholipids
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B. albumin
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C. waxes
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D. steroids
Correct Answer
A. B. albuminExplanation
Lipids are a diverse group of molecules that include phospholipids, waxes, and steroids. Phospholipids are a major component of cell membranes, waxes are found in the protective coatings of plants and animals, and steroids are important for various physiological functions. However, albumin is a protein and not a lipid. It is a soluble protein found in blood plasma and plays a role in maintaining osmotic pressure and transporting molecules.Rate this question:
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- 39.
DNA is replicated at this time of the cell cycle:
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A. G^0
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B. G^1
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C. S
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D. G^2
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E. M
Correct Answer
A. C. SExplanation
DNA is replicated during the S phase of the cell cycle. This is the phase where DNA synthesis occurs, and the cell prepares to divide by replicating its genetic material. The S phase is followed by the G2 phase, where the cell continues to grow and prepare for cell division. Therefore, the correct answer is C. S.Rate this question:
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- 40.
In analyzing the number of different bases in a DNA sample, which would be consistent with the base-pairing rules?
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A. A=G
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B. A+G=C+T
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C. A+T=G+T
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D. A=C
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E. G=T
Correct Answer
A. B. A+G=C+TExplanation
The correct answer is B. A+G=C+T. This answer is consistent with the base-pairing rules because it states that the amount of adenine (A) plus the amount of guanine (G) is equal to the amount of cytosine (C) plus the amount of thymine (T). This is in accordance with Chargaff's rules, which state that in DNA, the amount of adenine is equal to the amount of thymine, and the amount of guanine is equal to the amount of cytosine.Rate this question:
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- 41.
What characteristic of a protein will determine its function?
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A. pH level
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B. shape
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C. location
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D. length
Correct Answer
A. B. shapeExplanation
The shape of a protein is a critical characteristic that determines its function. Proteins are made up of long chains of amino acids that fold into specific three-dimensional shapes. This shape is essential for the protein to interact with other molecules and perform its specific function. Different shapes allow proteins to bind to specific targets, catalyze chemical reactions, transport molecules, or provide structural support. Therefore, the shape of a protein directly influences its ability to carry out its intended function.Rate this question:
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- 42.
The type of respiration that occurs within animal muscle cells to accomplish a quick energy gain is called
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A. lactic acid fermentation
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B. aerobic respiration
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C. alcoholic fermentation
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D. pyruvic respiration
Correct Answer
A. A. lactic acid fermentationExplanation
Lactic acid fermentation is the correct answer because it is the type of respiration that occurs within animal muscle cells to quickly gain energy. During intense exercise, when oxygen supply is limited, muscle cells switch to lactic acid fermentation to produce ATP. This process breaks down glucose into lactic acid, releasing energy in the process. This allows the muscles to continue contracting even without sufficient oxygen supply.Rate this question:
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- 43.
Among the three stages of aerobic respiration, thelargest amount of ATP payoff occurs
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A. glycolysis
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B. citric acid cycle
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C. oxidative phosphorolation
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D. transition reactions
Correct Answer
A. C. oxidative phosphorolationExplanation
The largest amount of ATP payoff occurs in oxidative phosphorylation. This stage of aerobic respiration occurs in the mitochondria and involves the transfer of electrons from NADH and FADH2 to the electron transport chain. As the electrons are passed along the chain, protons are pumped across the inner mitochondrial membrane, creating an electrochemical gradient. This gradient is then used by ATP synthase to produce ATP through chemiosmosis. Overall, oxidative phosphorylation produces the majority of the ATP molecules generated during aerobic respiration.Rate this question:
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- 44.
Chromosomes first become visible during which phase of mitosis?
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A. prometaphase
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B. telophase
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C. prophase
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D. metaphase
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E. anaphase
Correct Answer
A. C. prophaseExplanation
During prophase, the chromosomes condense and become visible under a microscope. This is the first stage of mitosis, where the nuclear envelope starts to break down and the spindle fibers begin to form. In prometaphase, the nuclear envelope fully disintegrates and the spindle fibers attach to the chromosomes. In metaphase, the chromosomes align at the center of the cell. In anaphase, the sister chromatids separate and move towards opposite poles of the cell. In telophase, the chromosomes reach the poles and the nuclear envelope reforms.Rate this question:
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- 45.
Type of RNA that carries amino acids within the cytoplasm is
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A. mRNA
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B. tRNA
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C. cRNA
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D. rRNA
Correct Answer
A. B. tRNAExplanation
tRNA, or transfer RNA, is the type of RNA that carries amino acids within the cytoplasm. This molecule plays a crucial role in protein synthesis by transferring the correct amino acids to the ribosomes, where they are assembled into a polypeptide chain according to the instructions carried by mRNA. tRNA has a specific structure that allows it to recognize and bind to both the mRNA codon and the corresponding amino acid, ensuring that the correct amino acid is added to the growing protein chain.Rate this question:
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- 46.
Enzymes ___________ energy of activation requred for reactions to occur.
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A. increase
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B. decrease
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C. eliminate
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D. maintain
Correct Answer
A. B. decreaseExplanation
Enzymes are biological catalysts that speed up chemical reactions in cells. They do this by lowering the energy of activation required for the reactions to occur. By decreasing the energy of activation, enzymes make it easier for the reactants to reach the transition state and proceed with the reaction. This allows reactions to happen more quickly and efficiently. Therefore, the correct answer is B. decrease.Rate this question:
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- 47.
Which of the following equations represent the overall reaction of aerobic cellular respiration?
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A. C^6H^12^O6 ----> 2 pyruvate + 2 ATP
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B. 6CO^2 + 6H^2O + energy ----> C^6H12O^6 + 6O^2
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C. C^6H^12O^6 + 6O^2 ----> 6CO^2 + 6H^2O + ATP
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D. C^6H^12O^6 ----> 2 alcohol + 2CO^2 + 2 ATP
Correct Answer
A. C. C^6H^12O^6 + 6O^2 ----> 6CO^2 + 6H^2O + ATPExplanation
The correct answer is C because it represents the overall reaction of aerobic cellular respiration. In this reaction, glucose (C6H12O6) is combined with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O), while also generating ATP. This equation accurately reflects the process of aerobic cellular respiration, where glucose is broken down in the presence of oxygen to release energy in the form of ATP, along with the production of carbon dioxide and water as waste products.Rate this question:
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- 48.
Citric acid cycle begins with the formationof the reactant(s)
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A. pyruvate
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B. acetyl-CoA
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C. NADH and carbon dioxide
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D. ATP and NADH
Correct Answer
A. B. acetyl-CoAExplanation
The citric acid cycle, also known as the Krebs cycle, is a series of chemical reactions that occur in the mitochondria of cells. It is an important part of cellular respiration, where glucose is broken down to produce energy in the form of ATP. The cycle begins with the formation of acetyl-CoA, which is derived from pyruvate. Acetyl-CoA enters the cycle and combines with oxaloacetate to form citrate, starting the series of reactions. Therefore, the correct answer is B. acetyl-CoA.Rate this question:
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- 49.
A solution that has a higher concentration of solute and a lower concentration of water than inside the cell is
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A. isotonic solution
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B. hypotonic solution
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C. hypertonic solution
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D.osmotic solution
Correct Answer
A. C. hypertonic solutionExplanation
A hypertonic solution has a higher concentration of solute and a lower concentration of water compared to inside the cell. When a cell is placed in a hypertonic solution, water will flow out of the cell to try to equalize the concentration of solute on both sides of the cell membrane. This causes the cell to shrink or shrivel up.Rate this question:
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Mar 21, 2023Quiz Edited by
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Dec 03, 2011Quiz Created by
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