Biology EOC Practice-randomized & Timed
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One difference between cytokinesis in plant cells and in animal cells is that plant cells have
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A cell plate.
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Chromatin.
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Centrioles.
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Centromeres
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38 questions; 45 minutes. This test randomly selects questions from quizzes that we have taken in class.
Quiz Preview
- 2.
During which phase of mitosis do the chromosomes line up along the equator (middle) of the dividing cell?
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Metaphase
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Telophase
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Anaphase
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Prophase
Correct Answer
A. MetaphaseExplanation
Chromosomes are pulled to the equator (middle) of the cell during metaphase. Metaphase = MiddleRate this question:
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- 3.
Crossing-over does not occur in mitosis, unlike meiosis. Which of the following is the likely reason?
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Chromatids are not involved in mitosis.
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A cell undergoing mitosis does not have homologous chromosomes.
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There is no prophase during mitosis.
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Homologous chromosomes do not pair up during mitosis.
Correct Answer
A. Homologous chromosomes do not pair up during mitosis.Explanation
Homologous chromosomes pair up during meiosis in order to exchange genes and ensure that each of the 4 gametes produced have 1 copy of each gene. Mitosis produces genetically identical cells so all of the chromosomes line up independently on the spindle.Rate this question:
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- 4.
Which of the following is a TRUE about the events of the cell cycle?
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The M phase is usually the longest phase.
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Interphase consists of the G1, S, and, G2 phases.
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Little happens during the G1 and G2 phases.
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DNA replicates during cytokinesis.
Correct Answer
A. Interphase consists of the G1, S, and, G2 phases.Explanation
Interphase is the longest stage of the cell cycle consisting of G1 (growth), S (DNA replication) and G2 (preparation for mitosis).Rate this question:
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- 5.
Which of the following is NOT a correct statement about the events of the cell cycle?
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The cell grows during the G1 phase.
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Cell division ends with cytokinesis.
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DNA replicates during the M phase.
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Interphase is usually the longest phase.
Correct Answer
A. DNA replicates during the M phase.Explanation
DNA replication occurs during the S phase of Interphase. M phase is cell division.Rate this question:
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- 6.
During what phase of meiosis does nondisjunction occur?
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Metaphase I
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Anaphase I
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Prophase II
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Metaphase II
Correct Answer
A. Anaphase IExplanation
Nondisjunction occurs when either Homologous Chromosomes fail to separate in Anaphase I or when Sister Chromatids fail to separate in Anaphase II.Rate this question:
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- 7.
Which of the following is NOT true about mitosis and meiosis?
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Mitosis produces somatic cells and Meiosis produces gametes.
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There are 2 separate divisions in Meiosis and only 1 division in Mitosis.
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Mitosis produces genetically identical cells and Meiosis produces genetically different cells.
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DNA replication happens once in Mitosis and DNA replicates twice in Meiosis.
Correct Answer
A. DNA replication happens once in Mitosis and DNA replicates twice in Meiosis.Explanation
In Meiosis, DNA replication only happens once (during interphase).Rate this question:
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- 8.
During what stage of Meiosis does crossing over occur?
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Between Prophase I and Anaphase I
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Between Prophase II and Anaphase II
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During Interphase
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Crossing over only occurs during Mitosis
Correct Answer
A. Between Prophase I and Anaphase IExplanation
Crossing over occurs when Homologous Chromosomes pair up during Prophase I and separate during Anaphase I.Rate this question:
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- 9.
During which phase of mitosis do spindle fibers separate (pull apart) sister chromatids?
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Anaphase
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Metaphase
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Prophase
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Telophase
Correct Answer
A. AnaphaseExplanation
Anaphase pulls apart sister chromatids.Rate this question:
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- 10.
At what point are the cells in Meiosis first considered haploid?
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Prophase I
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Prophase II
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Telophase II
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Haploid cells are NOT present throughout in meiosis.
Correct Answer
A. Prophase IIExplanation
At the end of Telophase I (and through all of Meiosis II), the cells are haploid.Rate this question:
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- 11.
Unlike mitosis, meiosis results in the formation of
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4 diploid cells.
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2 diploid cells.
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4 haploid cells.
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2 haploid cells.
Correct Answer
A. 4 haploid cells.Explanation
The purpose of Meiosis is to reduce the chromosome number by half.Rate this question:
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- 12.
The region labeled A in Figure 9-1 is called the
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Spindle.
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Centriole.
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Sister chromatid.
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Centromere.
Correct Answer
A. Centromere.Explanation
A chromosome consists of 2 sister chromatids (B) joined together at the centromere (A).Rate this question:
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- 13.
These diagrams represent different stages of animal cell division. From start to finish, what is the correct order of the stages?
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2, 4, 3, 1
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2, 3, 4, 1
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3, 2, 1, 4
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3, 1, 2, 4
Correct Answer
A. 2, 4, 3, 1Explanation
Prophase (chromosomes condense & nuclear membrane disappears)
Metaphase (chromosomes line up in the MIDDLE)
Anaphase (chromosomes are pulled APART)
Telophase (2 nuclear membranes form & cytokinesis occursRate this question:
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- 14.
What is the purpose of mitosis?
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To produce 2 diploid cells
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To produce 2 haploid cells
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To produce 4 diploid cells
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To produce 4 haploid cells
Correct Answer
A. To produce 2 diploid cellsExplanation
Mitosis produces 2 diploid cells. Meiosis produces 4 haploid cells.Rate this question:
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- 15.
What occurs during metaphase I of meiosis?
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Centromeres of replicated chromosomes line up along the cell’s equator.
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Centromeres divide as sister chromatids move toward opposite poles of the cell.
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Homologous chromosome pairs line up along the cell’s equator.
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Homologous chromosomes move toward opposite poles of the cell.
Correct Answer
A. Homologous chromosome pairs line up along the cell’s equator.Explanation
Metaphase I = homologous chromosomes are pulled to the middle of the cellRate this question:
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- 16.
Which of the following has the stages of the cell cycle in the correct sequence?
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G1, G2, S, Prophase, Anaphase, Metaphase, Telophase, Cytokinesis
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G1, S, G2, Prophase, Metaphase, Anaphase, Telophase, Cytokinesis
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G1, S, G2, Cytokinesis, Prophase, Metaphase, Anaphase, Telophase
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S, G1, G2, Metaphase, Anaphase, Telophase, Prophase, Cytokinesis
Correct Answer
A. G1, S, G2, Prophase, Metaphase, Anaphase, Telophase, CytokinesisExplanation
I = Interphase (G1, S, G2)
Play = Prophase
My = Metaphase
Accordion = Anaphase
To = Telophase
Cats = CytokinesisRate this question:
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- 17.
Which of the following is a major difference between the production of gametes in males and females?
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Male sperm will have always have an X chromosome but female eggs will have either an X or a Y chromosome.
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Males produce 4 viable cells but females only produce 1 viable cell and 3 polar bodies.
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Mitosis occurs in males and meiosis occurs in females.
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There is no difference between gamete production in males and females.
Correct Answer
A. Males produce 4 viable cells but females only produce 1 viable cell and 3 polar bodies.Explanation
Cytokinesis is uneven in oogenesis (production of eggs) which produces only one good egg and 3 unusable cells called polar bodies.Rate this question:
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- 18.
Which of the following is NOT true of crossing over?
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Crossing over occurs when homologous chromosomes exchange genetic material.
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Crossing over occurs during DNA replication.
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Crossing over increases genetic diversity.
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Crossing over usually only occurs during Meiosis.
Correct Answer
A. Crossing over occurs during DNA replication.Explanation
Crossing over occurs between Prophase I and Anaphase I of Meiosis.Rate this question:
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- 19.
What is the goal of basic scientific research in biology?
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Finding cures that will prolong human life through the study of disease
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Developing a more complete understanding of the interactions within and surrounding living organisms
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Creating a comprehensive set of laws that allow us to predict how matter behaves and interacts
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Providing a better understanding of the origin of life in the universe
Correct Answer
A. Developing a more complete understanding of the interactions within and surrounding living organismsExplanation
Basic scientific research in biology aims to develop a more complete understanding of the interactions within and surrounding living organisms. This involves studying various aspects of biology, such as the structure and function of cells, the mechanisms of genetic inheritance, and the relationships between organisms and their environment. By gaining a deeper understanding of these interactions, scientists can uncover new knowledge and insights that can be applied to various fields, including medicine, agriculture, and conservation. This goal of understanding the complexities of living organisms is fundamental to advancing biological knowledge and driving innovation in the field.Rate this question:
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- 20.
The theory of spontaneous generation was first proposed by ___.
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Needham
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Aristotle
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Plato
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Redi
Correct Answer
A. AristotleExplanation
Aristotle is the correct answer because he was the first to propose the theory of spontaneous generation. He believed that living organisms could arise from non-living matter through a process called abiogenesis. This theory was widely accepted for centuries until it was disproven by Francesco Redi's experiments in the 17th century. Aristotle's ideas on spontaneous generation had a significant influence on the scientific community and were widely taught and believed until more evidence-based theories emerged.Rate this question:
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- 21.
Dr. Hansen performs an experiment testing the effectiveness of different cough syrups. Identify the independent variable in the experiment.
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Number of people taking each cough syrup
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Type of cough syrup
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Number of days people take each cough syrup
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Flavor of the cough syrup
Correct Answer
A. Type of cough syrupExplanation
The independent variable in Dr. Hansen's experiment is the type of cough syrup. This is because it is the variable that is being manipulated or changed by the researcher. The other options listed (number of people taking each cough syrup, number of days people take each cough syrup, and flavor of the cough syrup) are not being intentionally manipulated by the researcher and therefore cannot be considered independent variables in this experiment.Rate this question:
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- 22.
Who helped disprove the idea of spontaneous generation by demonstrating that maggots come from fly eggs and NOT from meat?
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Louis Pasteur
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John Needham
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Francesco Redi
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Lazzaro Spallanzani
Correct Answer
A. Francesco RediExplanation
Francesco Redi helped disprove the idea of spontaneous generation by demonstrating that maggots come from fly eggs and not from meat. He conducted an experiment where he placed meat in two different jars - one covered and one uncovered. The uncovered jar attracted flies, which laid eggs on the meat, resulting in the development of maggots. However, the covered jar did not have any maggots, proving that the maggots did not spontaneously generate from the meat itself. This experiment provided evidence against the concept of spontaneous generation and supported the theory of biogenesis.Rate this question:
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- 23.
Mr. Johnson asked his class to examine and make scientific observations about a soccer ball. Which of the following is an inference NOT an observation?
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The object has never been used in a soccer game.
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The object is black and white.
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The object has a circumference of 71 cm.
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The object weighs 454 grams.
Correct Answer
A. The object has never been used in a soccer game.Explanation
An inference is a conclusion or deduction based on observations or evidence. In this case, the statement "The object has never been used in a soccer game" is an inference because it is not directly observable. It is a conclusion that can be drawn based on the absence of any signs of wear or damage on the soccer ball. Observations, on the other hand, are facts that can be directly observed or measured, such as the color, circumference, and weight of the object.Rate this question:
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- 24.
Aisha wants to conduct an experiment to determine whether sun and shade varieties of the same plant species prefer the same wavelengths of light. She plans to measure rates of photosynthesis. Which design would be best for her experiment?
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10 plants of the sun variety tested under blue light only; and 10 plants of the shade variety tested under blue light only
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40 plants of the sun variety: 10 tested under blue light, 10 under green, 10 under red, and 10 under yellow light with 40 plants of the shade variety: 10 tested under blue light, 10 under green, 10 under red, and 10 under yellow light
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1 plant of the sun variety tested under blue light only, and 1 plant of the shade variety tested under blue light only
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4 plants of the sun variety: 1 tested under blue light, 1 under green, 1 under red, and 1 under yellow light with 4 plants of the shade variety: 1 tested under blue light, 1 under green, 1 under red, and 1 under yellow light
Correct Answer
A. 40 plants of the sun variety: 10 tested under blue light, 10 under green, 10 under red, and 10 under yellow light with 40 plants of the shade variety: 10 tested under blue light, 10 under green, 10 under red, and 10 under yellow lightExplanation
The best design for Aisha's experiment would be to test 40 plants of the sun variety under different wavelengths of light (blue, green, red, and yellow) and also test 40 plants of the shade variety under the same wavelengths of light. This design allows Aisha to compare the rates of photosynthesis between the sun and shade varieties under different wavelengths of light, providing a comprehensive understanding of their light preferences. Testing multiple plants under each wavelength ensures that the results are more reliable and representative of the overall trend.Rate this question:
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- 25.
The process by which organisms keep their internal conditions fairly constant is called
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Metabolism.
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Homeostasis.
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Photosynthesis.
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Evolution.
Correct Answer
A. Homeostasis.Explanation
Homeostasis refers to the ability of organisms to maintain a stable internal environment despite external changes. It involves various physiological processes that regulate temperature, pH, blood sugar levels, and other vital parameters within a narrow range. Metabolism, on the other hand, refers to the chemical reactions that occur in the body to convert food into energy. Photosynthesis is the process by which plants convert sunlight into energy, while evolution refers to the gradual change in species over time. Therefore, homeostasis is the most appropriate answer as it directly relates to the concept of maintaining internal conditions.Rate this question:
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- 26.
Alice soaked six different kinds of seeds in water for 24 hours. Then she planted the seeds in soil at a depth of I cm. She used the same amount of water, light, and heat for each kind of seed.
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Recognize a problem
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Form a hypothesis
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Draw conclusions
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Perform an experiment
Correct Answer
A. Perform an experimentExplanation
The given scenario describes a situation where Alice is conducting an experiment by soaking six different kinds of seeds in water for 24 hours and then planting them in soil at a depth of 1 cm. She ensures that all the seeds receive the same amount of water, light, and heat. Therefore, the correct answer is "Perform an experiment" as Alice is actively carrying out the experiment by following a specific procedure to test her hypothesis or gather data to draw conclusions.Rate this question:
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- 27.
A student wants to determine whether temperature affects the rate at which mold grows on bread. The student puts one piece of bread inside a Petri dish, closes the lid, and places the Petri dish in the refrigerator. Which treatment would be the best comparison for this experiment?
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Placing another piece of bread in an open Petri dish in the same refrigerator
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Placing another piece of bread in an open Petri dish on the countertop
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Placing another piece of bread in a closed Petri dish on the countertop
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Placing another piece of bread in a closed Petri dish in the same refringerator
Correct Answer
A. Placing another piece of bread in a closed Petri dish on the countertopExplanation
Placing another piece of bread in a closed Petri dish on the countertop would be the best comparison for this experiment. This is because the student wants to determine the effect of temperature on the rate of mold growth on bread. By placing one piece of bread in a closed Petri dish in the refrigerator and another piece of bread in a closed Petri dish on the countertop, the only variable that is different between the two treatments is the temperature. This allows the student to compare the rate of mold growth on the bread in different temperature conditions and draw conclusions about the effect of temperature on mold growth.Rate this question:
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- 28.
Michael fed different diets to three groups of guinea pigs. His experiment showed that guinea pigs need vitamin C and protein in their diets.
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Form a hypothesis
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Draw conclusions
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Recognize a problem
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Perform an experiment
Correct Answer
A. Draw conclusionsExplanation
The correct answer is "Draw conclusions." After conducting the experiment where Michael fed different diets to three groups of guinea pigs, he was able to observe and analyze the results. Based on the findings that the guinea pigs need vitamin C and protein in their diets, he can draw conclusions about the importance of these nutrients for their health. This step involves interpreting the data collected during the experiment and making inferences or generalizations based on the results obtained.Rate this question:
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- 29.
The amount of light and temperature are examples of
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Factors that affect reproduction.
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Factors necessary for life.
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Methods of energy production.
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Factors to which living things respond.
Correct Answer
A. Factors to which living things respond.Explanation
The amount of light and temperature are examples of factors to which living things respond. Light is crucial for photosynthesis in plants, which is essential for their growth and reproduction. Temperature affects the metabolic rate of organisms, influencing their ability to survive and reproduce. Both light and temperature are environmental factors that living things can sense and respond to in order to adapt and ensure their survival and reproductive success.Rate this question:
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- 30.
Kevin said, “If I grow five seedlings in red light, then I think the plants will grow faster than the five plants grown in white light.” What is his dependent variable?
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Growth rate of the plants
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Color of light used
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Number of seedlings used
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Amount of water given to the plants
Correct Answer
A. Growth rate of the plantsExplanation
The dependent variable in this experiment is the growth rate of the plants. This is because Kevin is interested in comparing the growth rates of the plants grown in red light versus white light. By measuring and comparing the growth rates, Kevin will be able to determine if his hypothesis is correct or not. The growth rate of the plants is the outcome that is being observed and measured in this experiment.Rate this question:
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- 31.
The idea that life can come from non-living matter is called ___.
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Evolution
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Spontaneous generation
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Autotrophism
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Biogenesis
Correct Answer
A. Spontaneous generationExplanation
Spontaneous generation refers to the belief that living organisms can arise from non-living matter. This concept was widely accepted in ancient times but was later disproven by experiments conducted by Louis Pasteur in the 19th century. Pasteur's experiments showed that life only arises from pre-existing life, a principle known as biogenesis. Therefore, the correct answer is spontaneous generation.Rate this question:
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- 32.
Dr. Graham has written a paper on the internal temperature of nests of alligator eggs. His data shows that temperature determines the sex of the hatchlings. What is the best method of validating the reliability of Dr. Graham’s experiment?
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Dr. Graham should repeat the experiment at another time of year.
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Several scientists should observe Dr. Graham as he repeats the experiment.
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Several scientists should repeat the experiment using Dr. Graham’s design.
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Dr. Graham should clearly document the experimental process.
Correct Answer
A. Several scientists should repeat the experiment using Dr. Graham’s design.Explanation
The best method of validating the reliability of Dr. Graham's experiment is to have several scientists repeat the experiment using his design. This would help to ensure that the results are replicable and not specific to Dr. Graham's methods or biases. By having multiple scientists independently conduct the experiment and obtain similar results, it would strengthen the validity and reliability of the findings.Rate this question:
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- 33.
Which of the following characteristics of living things best explains why birds fly south for the winter?
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Living things are based on a universal genetic code.
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Living things are made up of units called cells.
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Living things respond to their environment.
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Living things maintain internal balance.
Correct Answer
A. Living things respond to their environment.Explanation
Birds flying south for the winter is a behavior that demonstrates how living things respond to their environment. In response to changes in temperature and food availability, birds instinctively migrate to more favorable conditions. This behavior allows them to survive and thrive in different environments throughout the year.Rate this question:
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- 34.
John Needham performed an experiment testing spontaneous generation. He boiled chicken broth, placed it in a sterile flask, and then sealed the flask. After a few days, Needham observed microorganisms in the flask. Based on current understanding, how was his experiment flawed?
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After Needham boiled the broth, microorganisms entered from the air.
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Microorganisms entered the broth from the flask itself after the flask was sealed.
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Boiling activated dormant microorganisms present in the broth.
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Boiling the broth did not kill all microorganisms present.
Correct Answer
A. Boiling the broth did not kill all microorganisms present.Explanation
The correct answer is that boiling the broth did not kill all microorganisms present. This is because the process of boiling is meant to kill any existing microorganisms in the broth, but if it fails to do so, then the microorganisms can still survive and grow in the sealed flask. This flaw in the experiment allowed the microorganisms to contaminate the broth and grow over time, leading to the observation of microorganisms in the flask.Rate this question:
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- 35.
Lazzaro Spallanzani and Louis Pasteur both performed experiments hoping to disprove spontaneous generation. What conditions existed in Pasteur’s experiment that did not exist in Spallanzani’s?
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Neither air nor microoganisms could enter the flasks.
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Air could enter the flasks, but no microorganisms could enter.
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Both air and microorganisms could enter the flasks.
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No air could enter the flasks, but microorganisms could enter.
Correct Answer
A. Air could enter the flasks, but no microorganisms could enter.Explanation
In Pasteur's experiment, air could enter the flasks, but no microorganisms could enter. This condition was different from Spallanzani's experiment, where neither air nor microorganisms could enter the flasks. By allowing air to enter the flasks, Pasteur was able to demonstrate that it was not the air itself that caused spontaneous generation, but rather the presence of microorganisms in the air. This helped to disprove the theory of spontaneous generation and support the concept of biogenesis.Rate this question:
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- 36.
In an experiment, a scientist filled 2 open flasks, as shown in the figures, with broth and boiled the broth until it became clear. He then left the flasks open for several days. Which results showed that spontaneous generation did not occur? {C}{C}
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The broth in Flask A became cloudy, and the broth in Flask B remained clear.
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The broth in Flask A remained clear, and the broth in Flask B became cloudy.
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The broth in both Flasks A and B became cloudy.
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The broth in both Flasks A and B remained clear.
Correct Answer
A. The broth in Flask A became cloudy, and the broth in Flask B remained clear.Explanation
The correct answer indicates that spontaneous generation did not occur because the broth in Flask A became cloudy, suggesting the growth of microorganisms, while the broth in Flask B remained clear, indicating the absence of any spontaneous generation. This result supports the idea that microorganisms were present in the environment and contaminated Flask A, rather than being spontaneously generated.Rate this question:
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- 37.
Which of the following is NOT a characteristic of all living things?
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Growth and development
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Response to the environment
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Ability to reproduce
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Ability to move
Correct Answer
A. Ability to moveExplanation
The ability to move is not a characteristic of all living things. While many living organisms are capable of movement, such as animals and some plants, there are also many organisms that are immobile, such as plants rooted in the ground or microorganisms that live in water. Therefore, the ability to move cannot be considered a universal characteristic of all living things.Rate this question:
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- 38.
Redi placed pieces of meat in several jars. He divided the jars into two groups. He covered the first group of jars with fine cloth. He left the secound group of jars uncovered. Redi observed the jars for several days. He saw flies on the cloth of the covered jars, and he saw flies laying eggs on the meat in the uncovered jars. Maggots appeared only on the meat in the group of jars left uncovered. What was the control in Redi’s experiment?
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The uncovered jars
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The covered jars
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The presence of maggots
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The type of meat
Correct Answer
A. The uncovered jarsExplanation
The control in Redi's experiment was the uncovered jars. The control group is the group that does not receive the experimental treatment, in this case, the jars that were left uncovered. By comparing the results of the uncovered jars to the covered jars, Redi was able to determine the effect of flies on the appearance of maggots.Rate this question:
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- 39.
A scientist found that the results of an experiment did not support her hypothesis. If she is following proper scientific procedure, what should she do next?
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Accept the hypothesis and exclude data that does not fit.
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Discard those results and repeat the experiment.
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Reject the hypothesis and assume it is incorrect.
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Create a new hypothesis and a new experiment to test it.
Correct Answer
A. Create a new hypothesis and a new experiment to test it.Explanation
If the scientist's experiment did not support her hypothesis, it means that the initial hypothesis was likely incorrect. To follow proper scientific procedure, she should reject the hypothesis and assume it is incorrect. In order to further investigate the phenomenon, she should create a new hypothesis and design a new experiment to test it. This allows for the scientific method to be followed, ensuring that conclusions are based on reliable and valid evidence.Rate this question:
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- 40.
A pigment is a light-absorbing molecule.
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True
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False
Correct Answer
A. TrueExplanation
A pigment is a substance that absorbs certain wavelengths of light and reflects others, resulting in the perception of color. This process occurs because pigments contain molecules that can absorb specific wavelengths of light, preventing them from passing through or being reflected. Therefore, it is correct to say that a pigment is a light-absorbing molecule.Rate this question:
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- 41.
Chlorophyll absorbs green light and reflects all other colors.
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True
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False
Correct Answer
A. FalseExplanation
Chlorophyll is a pigment found in plants that absorbs red and blue light, but reflects green light. This is why plants appear green to us. Therefore, the correct answer is false, as chlorophyll absorbs red and blue light and reflects green light.Rate this question:
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- 42.
What are the products of photosynthesis?
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Carbon dioxide and Water
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Light and ATP
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Glucose and Oxygen
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All of the answer choices are correct
Correct Answer
A. Glucose and OxygenExplanation
Photosynthesis is the process by which plants convert sunlight, carbon dioxide, and water into glucose and oxygen. Glucose is a type of sugar that serves as the primary source of energy for plants, while oxygen is released into the atmosphere as a byproduct. Therefore, the correct answer is "Glucose and Oxygen."Rate this question:
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- 43.
What are the reactants of Photosynthesis?
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Carbon dioxide and Water
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Light and ATP
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Glucose and Oxygen
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All of the answer choices are correct
Correct Answer
A. Carbon dioxide and WaterExplanation
The reactants of photosynthesis are carbon dioxide and water. During photosynthesis, plants use carbon dioxide from the atmosphere and water from the soil to produce glucose and oxygen. This process occurs in the chloroplasts of plant cells, specifically in the presence of sunlight and chlorophyll. The sunlight provides energy for the reaction, and ATP is produced as a result. The glucose produced during photosynthesis is used as a source of energy for the plant, while the oxygen is released into the atmosphere as a byproduct.Rate this question:
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- 44.
Chlorophyll a and chlorophyll b are different because
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They absorb different wavelengths of light
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They reflect different wavelengths of light
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One is found in the thylakoid and the other in the stroma
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All of the answer choices are correct
Correct Answer
A. They absorb different wavelengths of lightExplanation
Chlorophyll a and chlorophyll b are different because they absorb different wavelengths of light. This is due to the structural differences between the two types of chlorophyll molecules, which result in variations in their absorption spectra. Chlorophyll a primarily absorbs blue and red light, while chlorophyll b absorbs blue and red-orange light. This allows plants to capture a wider range of light energy for photosynthesis.Rate this question:
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- 45.
Which of the following in NOT a factor that affects the rate of photosynthesis?
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Temperature
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Carbon dioxide availability
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Water availability
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PH
Correct Answer
A. pHExplanation
pH is not a factor that affects the rate of photosynthesis. Photosynthesis is the process by which plants convert sunlight into energy, and it is primarily influenced by temperature, carbon dioxide availability, and water availability. pH, which measures the acidity or alkalinity of a solution, does not directly impact the rate of photosynthesis. However, extreme pH levels can affect the activity of enzymes involved in the process, indirectly influencing photosynthesis. Nonetheless, pH is not considered a major factor compared to temperature, carbon dioxide, and water availability.Rate this question:
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- 46.
What is the term used to describe the energy needed to get a reaction started?
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Adhesion energy
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Activation energy
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Cohesion energy
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Chemical energy
Correct Answer
A. Activation energyExplanation
Activation energy is the term used to describe the energy needed to get a reaction started. It is the minimum amount of energy required for a chemical reaction to occur. Activation energy is necessary to break the bonds between reactant molecules and initiate the formation of new bonds in the products. Without sufficient activation energy, the reaction will not proceed. Adhesion energy refers to the energy required to separate two different substances, cohesion energy is the energy required to separate similar substances, and chemical energy refers to the potential energy stored in chemical bonds.Rate this question:
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- 47.
Which of the following statements about enzymes is NOT true?
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Enzymes work best at a specified pH
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All enzymes have the same shaps as their substrates
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Enzymes are proteins
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The shape of an enzyme allows it to do its job
Correct Answer
A. All enzymes have the same shaps as their substratesExplanation
Enzymes are proteins that facilitate chemical reactions by binding to specific substrates. The shape of an enzyme is crucial for its function as it allows it to bind to the substrate and catalyze the reaction. However, it is not true that all enzymes have the same shape as their substrates. Enzymes have a specific three-dimensional structure that is complementary to their substrates, allowing for specific binding and catalysis. This specificity is essential for the efficiency and accuracy of enzymatic reactions. Therefore, the statement "All enzymes have the same shape as their substrates" is not true.Rate this question:
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- 48.
Which of the following statements is true about catalysts?
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Catalysts slow down the rate of chemical reactions
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All catalysts are enzymes
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Catalysts are used up during a chemical reaction
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Catalysts lower the activation energy of a chemical reaction
Correct Answer
A. Catalysts lower the activation energy of a chemical reactionExplanation
Catalysts lower the activation energy of a chemical reaction. Activation energy is the energy required to start a chemical reaction. Catalysts work by providing an alternative reaction pathway with a lower activation energy, allowing the reaction to occur more easily and at a faster rate. This means that catalysts do not get used up during the reaction and can be used repeatedly. It is important to note that not all catalysts are enzymes, as enzymes are a specific type of catalyst found in biological systems.Rate this question:
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- 49.
A substance that accelerates the rate of a chemical reaction is called a(an)
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Catalyst
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Lipid
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Molecule
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Protein
Correct Answer
A. CatalystExplanation
A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process. It works by providing an alternative pathway for the reaction to occur with lower activation energy. This allows the reaction to proceed faster and more efficiently. Catalysts are commonly used in various industries and biological systems to speed up reactions and save energy.Rate this question:
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Mar 21, 2023Quiz Edited by
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Apr 23, 2013Quiz Created by
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