Biology Midterm Test Corrections
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Chose the set of traits that would complete this punnett square.
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RR, RR, Rr, Rr
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RR, Rr, Rr, rr
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Rr, rr, RR, Rr
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The Biology Midterm Test Corrections quiz assesses understanding of fundamental biological concepts including cell types, homeostasis, enzymes, and cellular respiration. It helps learners identify and correct misconceptions, enhancing their comprehension of essential biology topics.
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- 2.
Short, hairlike projections used for locomotion are
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Prokaryote
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Cilia
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Cell wall
Correct Answer
A. CiliaExplanation
Cilia are short, hairlike projections found on the surface of certain cells. They are used for locomotion and help to move substances across the cell's surface. Cilia are present in various organisms, including some prokaryotes and eukaryotes. They play a crucial role in processes such as the movement of mucus in the respiratory tract and the movement of eggs in the female reproductive system.Rate this question:
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- 3.
What is homeostasis?
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A genetic disorder
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A steady state
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An unsteady state
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An extinct form of human
Correct Answer
A. A steady stateExplanation
Homeostasis refers to the ability of an organism or system to maintain a stable internal environment despite external changes. It involves various physiological processes that work together to regulate temperature, pH levels, blood pressure, and other vital parameters within a narrow range. This steady state is crucial for the proper functioning of cells and organs. Therefore, the correct answer is "A steady state."Rate this question:
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- 4.
How many chromosomes do you inherit from your mom?
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34
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46
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23
Correct Answer
A. 23Explanation
When a baby is conceived, they inherit 23 chromosomes from their mother. This is because each parent contributes half of the baby's genetic material. The mother's egg contains 23 chromosomes, which combine with the 23 chromosomes from the father's sperm to form a complete set of 46 chromosomes in the baby's cells. Therefore, the correct answer is 23.Rate this question:
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- 5.
If "T" represents the gene for spiked tail and "t" represents the gene for no spikes, which of the following would represent a heterozygous individual?
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TT
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Tt
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Tt
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T
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T
Correct Answer
A. TtExplanation
A heterozygous individual has two different alleles for a particular gene. In this case, "T" represents the gene for spiked tail and "t" represents the gene for no spikes. Therefore, the individual represented by "Tt" is heterozygous because it has one allele for spiked tail (T) and one allele for no spikes (t).Rate this question:
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- 6.
The passing on of traits from an organism to its offspring is known as
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Biology
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Chemistry
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Heredity
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Zoology
Correct Answer
A. HeredityExplanation
Heredity refers to the passing on of traits from one generation to the next. It involves the transmission of genetic information from parents to their offspring. This process is responsible for the similarities and differences observed among individuals within a species. Biology, chemistry, and zoology are all branches of science, but they do not specifically refer to the passing on of traits. Therefore, heredity is the correct answer.Rate this question:
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- 7.
When one gene in a pair totally dominates another gene, the genes are said to show:
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Heterozygous
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Complete dominance
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Incomplete dominance
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Meiosis
Correct Answer
A. Complete dominanceExplanation
Complete dominance occurs when one gene in a pair completely masks the expression of the other gene. In this case, the dominant gene is expressed, while the recessive gene remains hidden. This means that the phenotype of the dominant gene is observed in the individual, while the recessive gene's phenotype is not visible. It is important to note that complete dominance does not necessarily mean that the dominant allele is more common or advantageous, but rather that it is expressed over the recessive allele in heterozygous individuals.Rate this question:
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- 8.
Crossing-over allows for
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More cells
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Less cells
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Each daughter cell to be diverse
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Each daughter cell to be the same
Correct Answer
A. Each daughter cell to be diverseExplanation
Crossing-over is a process during meiosis where genetic material is exchanged between homologous chromosomes. This exchange leads to genetic recombination and creates new combinations of alleles in the daughter cells. As a result, each daughter cell becomes genetically diverse, containing a unique combination of genetic information from both parents. This diversity is essential for the survival and adaptation of organisms, as it introduces variation and increases the chances of beneficial traits being passed on to future generations.Rate this question:
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- 9.
How many total chromosome do you inherit from your parents?
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23
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46
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89
Correct Answer
A. 46Explanation
Humans inherit a total of 46 chromosomes from their parents. This is because each parent contributes 23 chromosomes, which combine to form a total of 46 chromosomes in each cell of the offspring's body. These chromosomes contain the genetic information that determines various traits and characteristics of an individual.Rate this question:
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- 10.
Hh is an example of an organism's
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Cell
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Genotype
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Phenotype
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Chromosome
Correct Answer
A. GenotypeExplanation
Hh is an example of an organism's genotype because it represents the combination of alleles (Hh) that an organism inherits for a specific trait. Genotype refers to the genetic makeup of an organism, which determines its physical characteristics (phenotype). In this case, H and h represent different versions of the gene for the trait, and the combination of these alleles determines the organism's genotype.Rate this question:
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- 11.
What are monomers of proteins?
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Amino acids
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Carbohydrate chains
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Monosaccharides
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Nucleic acids
Correct Answer
A. Amino acidsExplanation
Proteins are made up of long chains of amino acids. These amino acids are the monomers, or building blocks, of proteins. Each amino acid consists of an amino group, a carboxyl group, and a unique side chain. These side chains determine the properties and functions of the amino acids, and ultimately the structure and function of the proteins they form. Therefore, the correct answer is amino acids.Rate this question:
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- 12.
Where does transciption occur?
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Ribosomes
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Nucleus
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Mitochondria
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Cytoplasm
Correct Answer
A. NucleusExplanation
Transcription, the process of synthesizing RNA from DNA, occurs in the nucleus of eukaryotic cells. This is where the DNA is located, and it needs to be transcribed into RNA before it can be translated into proteins. Ribosomes, mitochondria, and cytoplasm are not involved in transcription. Ribosomes are responsible for protein synthesis during translation, mitochondria are involved in energy production, and cytoplasm is the location where many cellular processes occur, including translation. However, transcription specifically takes place in the nucleus.Rate this question:
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- 13.
Which of the following is the correct sequence of stages in cellular respiration?
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Citric acid cycle, glycolysis, electron transport chain
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Electron transport chain, glycolysis, citric acid cycle
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Glycolysis, citric acid cycle, electron transport chain
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Citric acid cycle, electron transport chain, glycolysis
Correct Answer
A. Glycolysis, citric acid cycle, electron transport chainExplanation
The correct sequence of stages in cellular respiration is glycolysis, citric acid cycle, electron transport chain. Glycolysis is the first step in cellular respiration where glucose is broken down into pyruvate. The citric acid cycle follows glycolysis and is also known as the Krebs cycle. During this stage, pyruvate is further broken down and carbon dioxide is released. Finally, the electron transport chain occurs, where the high-energy electrons produced in glycolysis and the citric acid cycle are used to generate ATP.Rate this question:
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- 14.
The term anaerobic means ____________________.
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Without ATP
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Without 02
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With 02
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Without C02
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Without bacteria
Correct Answer
A. Without 02Explanation
The term anaerobic means without oxygen.Rate this question:
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- 15.
If an offspring receives two genes, one from each parent, for a particular recessive trait, that trait will
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Not be seen
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Be seen halfway
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Be seen
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None of the above
Correct Answer
A. Be seenExplanation
If an offspring receives two genes, one from each parent, for a particular recessive trait, that trait will be seen. This is because a recessive trait only manifests when an individual has two copies of the recessive gene. If the offspring receives one copy of the recessive gene from each parent, they will have two copies of the gene and therefore display the trait.Rate this question:
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- 16.
The visible characteristics of an organism are called:
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Cells
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Genotypes
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Phenotypes
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Chromosomes
Correct Answer
A. PhenotypesExplanation
Phenotypes refer to the observable traits or characteristics of an organism, such as its physical appearance, behavior, or any other measurable feature. These traits are influenced by the interaction between an organism's genetic makeup (genotype) and its environment. While cells, genotypes, and chromosomes are all important components of an organism, they do not specifically encompass the visible characteristics of an organism. Therefore, the correct answer is phenotypes.Rate this question:
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- 17.
Process of taking material into the cell by means of infoldings or pockets in the cell membrane
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Exocytosis
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Phagocytosis
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Endocytosis
Correct Answer
A. EndocytosisExplanation
Endocytosis is the process by which cells take in material through infoldings or pockets in the cell membrane. It involves the formation of vesicles that enclose the external material and bring it into the cell. This process is essential for the cell to acquire nutrients, transport molecules, and regulate various cellular functions. Exocytosis, on the other hand, is the opposite process where cells release material from vesicles to the extracellular space. Phagocytosis specifically refers to the engulfment of large particles or microorganisms by cells, which is a type of endocytosis.Rate this question:
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- 18.
When a red flower was crossed with a white flower, it produced a pink flower. what can you say about the parent's genes for this trait?
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Codominant
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Dihybrid
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Incomplete dominance
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Hybrid
Correct Answer
A. Incomplete dominanceExplanation
In the given scenario, the crossing of a red flower with a white flower resulting in a pink flower indicates incomplete dominance. This means that neither the red nor the white trait is dominant over the other, and instead, a blending of the two traits occurs, resulting in an intermediate phenotype. Incomplete dominance suggests that the parents' genes for this trait are not fully dominant or recessive, but rather exhibit a unique pattern of expression.Rate this question:
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- 19.
Where do transcription and translation take place
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Both take place in the nucleus
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Both take place in the cytoplasm
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Transcription takes place in the nucleus and translation takes place in the cytoplasm
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Translation takes place in the nucleus and transcription takes place in the cytoplasm.
Correct Answer
A. Transcription takes place in the nucleus and translation takes place in the cytoplasmExplanation
Transcription is the process of synthesizing RNA from a DNA template, and it occurs in the nucleus of eukaryotic cells. The DNA molecule is unwound, and an RNA polymerase enzyme binds to the DNA and begins to transcribe it into a complementary RNA strand.
Translation is the process of synthesizing proteins from RNA molecules, and it occurs in the cytoplasm. The mRNA molecule, which was transcribed in the nucleus, is transported out of the nucleus and into the cytoplasm. There, ribosomes bind to the mRNA and read the genetic code to assemble the corresponding amino acids into a protein.
Therefore, transcription takes place in the nucleus, while translation takes place in the cytoplasm.Rate this question:
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- 20.
MRNA codons are read in groups of _______________ nucleotides
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Two
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Three
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Four
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Ten
Correct Answer
A. ThreeExplanation
mRNA codons are read in groups of three nucleotides. Each three-nucleotide codon corresponds to a specific amino acid or a stop signal. This grouping allows the ribosome to accurately translate the mRNA sequence into a protein during the process of protein synthesis. By reading the codons in sets of three, the ribosome ensures that the correct amino acids are added to the growing polypeptide chain, leading to the formation of a functional protein.Rate this question:
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- 21.
In RNA consensus sequence thymine is basepaired with
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Adenine
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Uracil
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Guanine
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Cytosine
Correct Answer
A. AdenineExplanation
In RNA consensus sequence, thymine is replaced by uracil. Therefore, adenine is basepaired with uracil in RNA instead of thymine.Rate this question:
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- 22.
Which stage of Mitosis is depicted in the diagram below?
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Metaphase
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Telophase
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Anaphase
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Prophase
Correct Answer
A. AnaphaseExplanation
The correct answer is Anaphase because in the diagram, the chromosomes are seen moving away from each other towards opposite poles of the cell. This is a characteristic of Anaphase, which is the stage of mitosis where the sister chromatids separate and are pulled towards opposite ends of the cell by the spindle fibers.Rate this question:
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- 23.
Alleles are:
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Different forms of chromosomes
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Different forms of DNA
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Different forms of genes
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Different forms of cells
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Always homozygous
Correct Answer
A. Different forms of genesExplanation
Alleles are different forms of genes. Genes are segments of DNA that contain the instructions for building proteins. Alleles are alternative versions of a gene that can exist at the same locus on a chromosome. They can vary in their DNA sequence, which results in different traits or characteristics. For example, there can be different alleles for eye color, such as blue, green, or brown. Therefore, the correct answer is "different forms of genes".Rate this question:
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- 24.
The longest phase of the cell cycle is
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Prophase
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Interphase
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Metaphase
Correct Answer
A. InterphaseExplanation
Interphase is the longest phase of the cell cycle because it encompasses the period between cell divisions. During interphase, the cell grows and carries out its normal functions, such as protein synthesis and DNA replication. This phase is divided into three subphases: G1 phase, S phase, and G2 phase. G1 phase is the period of cell growth, S phase is when DNA replication occurs, and G2 phase is the preparation for cell division. Overall, interphase is essential for the cell to grow and duplicate its genetic material before entering the next phase of the cell cycle.Rate this question:
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- 25.
Which of the following always uses transport proteins?
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Diffusion
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Facilitated diffusion
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Osmosis
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Endocytosis
Correct Answer
A. Facilitated diffusionExplanation
Facilitated diffusion always uses transport proteins to move molecules across the cell membrane. Unlike simple diffusion, which allows molecules to pass directly through the lipid bilayer, facilitated diffusion requires the assistance of specific proteins. These transport proteins create channels or carriers that allow certain molecules to pass through the membrane, even if they are too large or polar to diffuse freely. This process does not require energy and moves molecules down their concentration gradient.Rate this question:
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- 26.
In plants, the structures that transform light energy into chemical energy are called
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Chlorplasts
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Organelles
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Cilia
Correct Answer
A. ChlorplastsExplanation
Chloroplasts are the structures in plants that contain chlorophyll, a pigment that absorbs light energy. Through the process of photosynthesis, chloroplasts convert this light energy into chemical energy in the form of glucose. This process is essential for plants to produce food and oxygen. Therefore, chloroplasts are responsible for transforming light energy into chemical energy in plants.Rate this question:
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- 27.
In cellular respiration, most ATP is produced directly as a result of ___________________.
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The electron transport chain
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Glycolysis
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The movement of hydrogen ions across the inner mitochondrial membrane
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Fermentation
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The citric acid cycle
Correct Answer
A. GlycolysisExplanation
Glycolysis is the correct answer because it is the process that occurs in the cytoplasm of cells and is the first step in cellular respiration. During glycolysis, glucose is broken down into pyruvate, and a small amount of ATP is produced directly. The other options mentioned, such as the electron transport chain, the movement of hydrogen ions across the inner mitochondrial membrane, fermentation, and the citric acid cycle, are all important components of cellular respiration but do not directly produce the majority of ATP.Rate this question:
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- 28.
Which of these equations describes aerobic cellular respiration?
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Glucose-lactic acid + energy
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Energy + carbon dioxide + water - glucose + oxygen + water
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Glucose + lactose - galactose + water
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Glucose + oxygen - carbon dioxide + water + energy
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Glucose -ethyl alcohol + carbon dioxide + energy
Correct Answer
A. Glucose + oxygen - carbon dioxide + water + energyExplanation
The equation "glucose + oxygen - carbon dioxide + water + energy" describes aerobic cellular respiration. This equation represents the process by which glucose and oxygen are used to produce carbon dioxide, water, and energy in the form of ATP. This is the process that occurs in the mitochondria of cells to generate energy for cellular activities.Rate this question:
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- 29.
Which of these is an inherited trait?
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Liking the color red
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Having long fingers
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Wearing your hair in a ponytail
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Liking chocolate ice cream
Correct Answer
A. Having long fingersExplanation
Having long fingers is an inherited trait because it is determined by genetics and is passed down from parents to their offspring. The length of fingers is determined by the genes responsible for bone growth and development, which are inherited from our parents. Therefore, individuals with long fingers most likely have inherited this trait from their parents or ancestors.Rate this question:
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- 30.
A change in a gene is known as a
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Genetic
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Genetic mutation
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Probability
Correct Answer
A. Genetic mutationExplanation
A change in a gene is known as a genetic mutation. This term refers to any alteration or modification that occurs in the DNA sequence of a gene. Genetic mutations can occur spontaneously or can be caused by external factors such as exposure to certain chemicals or radiation. These mutations can have various effects on an organism, ranging from no noticeable impact to causing genetic disorders or diseases. Therefore, the correct answer is genetic mutation.Rate this question:
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- 31.
In humans, which chromosome combination is that of a male?
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XX
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XY
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YY
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YMCA
Correct Answer
A. XYExplanation
The correct answer is XY. In humans, the chromosome combination of XY is typically associated with males. This is because males have one X chromosome and one Y chromosome, while females have two X chromosomes (XX). The Y chromosome contains genes that determine male sexual characteristics, such as the development of testes and the production of sperm. Therefore, the XY chromosome combination is indicative of a male individual.Rate this question:
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- 32.
The main type of molecule that makes up the plasma membrane is the ___________molecule. It has a polar end and a nonpolar end.
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Phospholipid
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Protein
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Cholesterol
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Carbohydrate
Correct Answer
A. PhospholipidExplanation
The main type of molecule that makes up the plasma membrane is the phospholipid molecule. Phospholipids have a polar end and a nonpolar end. This structure allows them to form a bilayer in the plasma membrane, with the polar heads facing the aqueous environment on the outside and inside of the cell, and the nonpolar tails facing each other in the center of the membrane. This arrangement provides a barrier that separates the internal contents of the cell from the external environment, while still allowing for the selective movement of molecules in and out of the cell.Rate this question:
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- 33.
Given the DNA strand, what is the mRNA sequence GCATTAGCCATC
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CGUAAUCGGUAG
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TGUAAUTGGUAG
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CGTAATCGGTAG
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CTUAAUCTTUAT
Correct Answer
A. CGUAAUCGGUAGExplanation
The mRNA sequence is CGUAAUCGGUAG because it is the complementary RNA strand of the given DNA strand. In RNA, the base pairs are A-U and C-G, so each base in the DNA strand is replaced with its complementary base in the mRNA sequence.Rate this question:
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- 34.
Where does DNA replication occur?
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Nucleus
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Ribosome
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Cytoplasm
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Mitochondria
Correct Answer
A. NucleusExplanation
DNA replication occurs in the nucleus. This is because the nucleus is where the DNA is located in eukaryotic cells. During replication, the DNA strands separate and new complementary strands are synthesized. This process takes place within the nucleus to ensure that the genetic information is accurately replicated before being passed on to daughter cells during cell division. The ribosome is responsible for protein synthesis, the cytoplasm is the fluid-filled region outside the nucleus, and the mitochondria are responsible for energy production, so these options are not correct.Rate this question:
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- 35.
The second state of aerobic respiration is ________________________.
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The electron transport chain
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The calvin cycle
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The citric acid cycle
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Lactic acid fermentation
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Glycolysis
Correct Answer
A. The citric acid cycleExplanation
The second stage of aerobic respiration is the citric acid cycle. This cycle, also known as the Krebs cycle, takes place in the mitochondria and is responsible for generating energy in the form of ATP. During the citric acid cycle, acetyl-CoA is oxidized, producing NADH and FADH2, which carry high-energy electrons to the electron transport chain for further ATP production. This cycle also releases carbon dioxide as a waste product. Overall, the citric acid cycle plays a crucial role in the breakdown of glucose and the production of energy in aerobic organisms.Rate this question:
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- 36.
What is the science of heredity called?
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Skills
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Genetics
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Reproduction
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Heredity
Correct Answer
A. GeneticsExplanation
Genetics is the science of heredity, which involves the study of genes, traits, and the passing of characteristics from parents to offspring. It encompasses the understanding of how genes are inherited, how they determine various physical and biological traits, and how they can be passed on through generations. By studying genetics, scientists can gain insights into the causes of genetic disorders, develop treatments, and explore the diversity and evolution of life forms.Rate this question:
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- 37.
A trait that is the "weaker" of 2 traits is called
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Incomplete
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Dominant
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Recessive
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Heterozygous
Correct Answer
A. RecessiveExplanation
A trait that is "weaker" or less likely to be expressed when paired with a contrasting trait is called recessive. In genetics, traits are determined by alleles, and recessive alleles are only expressed when an individual has two copies of the recessive allele. In contrast, dominant traits are expressed even if an individual only has one copy of the dominant allele. Therefore, recessive traits are considered the "weaker" of the two traits because they are less likely to be seen in the presence of a dominant allele.Rate this question:
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- 38.
Which type of RNA have codons
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MRNA
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TRNA
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RRNA
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URNA
Correct Answer
A. MRNAExplanation
mRNA, or messenger RNA, is the type of RNA that carries the genetic information from DNA to the ribosomes in the cytoplasm. It contains codons, which are sequences of three nucleotides that code for specific amino acids during protein synthesis. These codons are recognized by tRNA molecules, which bring the corresponding amino acids to the ribosomes. Therefore, mRNA is responsible for carrying the codons that determine the sequence of amino acids in a protein.Rate this question:
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- 39.
What is a difference between saturated and unsaturated fats?
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Saturated fats are liquid and unsaturated fats are solid.
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Saturated fats are solid and unsaturated fats are liquid.
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Saturated fats are healthier for you than unsaturated fats.
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Saturated fats contain double carbon bonds and unsaturated fats have single bonds.
Correct Answer
A. Saturated fats are solid and unsaturated fats are liquid.Explanation
The explanation for the given correct answer is that saturated fats are solid at room temperature because their fatty acid chains are fully saturated with hydrogen atoms, allowing them to pack tightly together. On the other hand, unsaturated fats are liquid at room temperature because they contain double carbon bonds in their fatty acid chains, causing them to have kinks and preventing them from packing tightly together.Rate this question:
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- 40.
Each half of a chromosome is called:
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Centromere
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Mitochondrion
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Chromatid
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Centrosome
Correct Answer
A. ChromatidExplanation
A chromosome is made up of two identical halves called chromatids, which are connected at the centromere. During cell division, each chromatid is separated and distributed to the daughter cells, ensuring that each cell receives a complete set of genetic information. The centromere plays a crucial role in this process by holding the chromatids together until they are ready to separate. Therefore, the correct answer is chromatid.Rate this question:
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- 41.
What event does NOT take place before the start of mitosis?
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Organelle proliferate
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DNA is replicated
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The nuclear envelope disintegrates
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The parent cell grows
Correct Answer
A. The nuclear envelope disintegratesExplanation
Before the start of mitosis, organelles proliferate, DNA is replicated, and the parent cell grows. However, the nuclear envelope does not disintegrate before mitosis. The disintegration of the nuclear envelope occurs during prophase, which is the first phase of mitosis. During prophase, the nuclear envelope breaks down, allowing the chromosomes to be released into the cytoplasm and interact with the spindle fibers.Rate this question:
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- 42.
If human cells have 46 chromosomes, the sex cells must have_________ chromosomes.
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46
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92
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64
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23
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42
Correct Answer
A. 23Explanation
Human cells have 46 chromosomes, which are arranged in pairs. Sex cells, also known as gametes, are produced through a process called meiosis, which involves the division of cells. During meiosis, the number of chromosomes is halved, resulting in gametes with only 23 chromosomes. This reduction in chromosome number is necessary for sexual reproduction to occur, as it ensures that when the gametes combine during fertilization, the resulting offspring will have the correct number of chromosomes. Therefore, the correct answer is 23.Rate this question:
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- 43.
What organelles are not in animal cells that are in plant cells?
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Large vacuole, cell wall, chloroplast
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Rough ER, cell wall, large vacuole
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Chloroplast, large vacuole, centrioles
Correct Answer
A. Large vacuole, cell wall, chloroplastExplanation
Animal cells do not have a cell wall or chloroplasts, which are present in plant cells. The cell wall provides structural support and protection to plant cells, while chloroplasts are responsible for photosynthesis. However, animal cells do have small vacuoles, but not large vacuoles like plant cells. Vacuoles in plant cells store water, nutrients, and waste products.Rate this question:
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- 44.
_______ is the property of a membrane that allows some materials to pass through while keeping others out.
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Selective permeability
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Porosity
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Malleability
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Instinctive liability
Correct Answer
A. Selective permeabilityExplanation
Selective permeability refers to the property of a membrane that enables it to selectively allow certain materials to pass through while preventing the passage of others. This ability is crucial for maintaining the balance and integrity of cells and tissues. It allows the membrane to regulate the movement of substances such as ions, molecules, and water, ensuring that only necessary substances are allowed in or out. This process is essential for various biological functions, including nutrient uptake, waste removal, and cell signaling. Porosity refers to the presence of small holes or gaps in a material, malleability refers to the ability of a substance to be easily shaped or molded, and instinctive liability is not a relevant term in this context.Rate this question:
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- 45.
Given the DNA sequence, what is the DNA replication AGCTTAACGGTA
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TCGAATTGCCAT
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UCGAAUUGCCAU
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TAGCCTTACCT
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UTACCUUATTCCU
Correct Answer
A. TCGAATTGCCATExplanation
The given DNA sequence is the complementary strand of the original DNA sequence. DNA replication is the process by which a DNA molecule is copied to produce two identical DNA molecules. During replication, the original DNA strands separate and each strand serves as a template for the synthesis of a new complementary strand. The answer provided is the complementary strand of the original DNA sequence, indicating that it is the result of DNA replication.Rate this question:
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- 46.
The 3 nucleotide tRNA sequence that is the matching sequence to the codon on the mRNA
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Anticodon
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Gentetic code
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Amino acids
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RRNA
Correct Answer
A. AnticodonExplanation
The correct answer is "anticodon". In protein synthesis, tRNA molecules carry specific amino acids to the ribosome, where they are matched with the corresponding codon on the mRNA. The anticodon is a sequence of three nucleotides on the tRNA molecule that is complementary to the codon on the mRNA. This complementary base pairing ensures that the correct amino acid is added to the growing protein chain during translation.Rate this question:
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- 47.
What is the independent variable?
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What is measured
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What is changed
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What is kept the same
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None of these
Correct Answer
A. What is changedExplanation
The independent variable refers to the factor that is intentionally manipulated or changed by the researcher in an experiment. It is the variable that is hypothesized to have an effect on the dependent variable. In this case, the correct answer "what is changed" accurately describes the concept of the independent variable.Rate this question:
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- 48.
Which of the following would be a genotype of a homozygous recessive individual?
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AaBB
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AABB
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AaBb
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AABb
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Aabb
Correct Answer
A. AabbExplanation
The genotype of a homozygous recessive individual would consist of two lowercase letters, indicating that both alleles for a particular trait are recessive. In this case, the genotype "aabb" fits this description, as it contains only lowercase letters and does not have any dominant alleles.Rate this question:
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- 49.
The chart used by scientists to show possible combinations resulting from a cross between two organisms is a:
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Punnett square
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Pedigree
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Phenotypic diagram
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Genotypic diagram
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Pie chart
Correct Answer
A. Punnett squareExplanation
A punnett square is a chart used by scientists to show the possible combinations resulting from a cross between two organisms. It is commonly used in genetics to predict the probability of certain traits being passed on to offspring. The punnett square allows scientists to visualize the different genotypes and phenotypes that can result from a genetic cross, making it a useful tool in understanding inheritance patterns.Rate this question:
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