AP Biology : Cell Functions

Study concepts, example questions & explanations for AP Biology

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Example Questions

Example Question #281 : Cell Functions

Which of the following cells will undergo meiosis? 

Possible Answers:

All of these

Amoebae

Heart cells

Germ cells

Unicellular organisms

Correct answer:

Germ cells

Explanation:

Germ cells give rise to gametes through meiosis. All of the other organisms listed are asexually reproducing organisms and therefore only undergo mitosis. 

Example Question #451 : Ap Biology

In which two phases can nondisjunction occur?

Possible Answers:

Anaphase I and anaphase II

Anaphase I and metaphase II

Metaphase I and metaphase II 

Telophase I and telophase II

Metaphase I and anaphase II

Correct answer:

Anaphase I and anaphase II

Explanation:

Nondisjunction of homologous chromosomes may occur in anaphase I and nondisjunction of sister chromatids may occur in anaphase II. 

Example Question #64 : Understanding Meiosis

Which of the following is the basis for independent assortment of homologous chromosomes?

Possible Answers:

Spindles align chromosomes randomly in anaphase  I 

Homologous chromosomes line up randomly at the metaphase plate in metaphase I 

Recombination occurs in telophase I 

Chromosomes are paired into tetrads in prophase I 

Homologous chromosomes undergo crossover in prophase I 

Correct answer:

Homologous chromosomes line up randomly at the metaphase plate in metaphase I 

Explanation:

Independent assortment depends upon random alignment of homologous chromosomes in metaphase I which will result in randomly assorted chromosomes into two daughter cells at the end of meiosis I. Crossover, or recombination, occurs in prophase I which contributes to genetic diversity, but does not affect random alignment of homologous chromosomes. Spindles align chromosomes randomly in metaphase I, not anaphase I during which they are already "aligned" and are moving towards opposite poles of the cell.

Example Question #162 : Cellular Division

In the process of meiosis, what is the correct description of the gametes?

Possible Answers:

The gametes are diploid, with half the number of chromosomes compared to the parent cell

The gametes are diploid, with twice the number of chromosomes compared to the parent cell

The gametes are polyploid

The gametes are haploid, with half the number of chromosomes compared to the parent cell

Correct answer:

The gametes are haploid, with half the number of chromosomes compared to the parent cell

Explanation:

In meiosis, the gametes are haploid having half the number of chromosomes of a diploid cell.  The gametes are the egg or sperm cells that combine in sexual reproduction.

Example Question #163 : Cellular Division

Homologous pairs of chromosomes separate depending on the random way they line up on the metaphase plate during metaphase I. What is this process called?

Possible Answers:

Independent assortment

G1 phase

Glycolysis

Cytokinesis

Mitosis

Correct answer:

Independent assortment

Explanation:

Random rearranging of alleles on chromosomes that occurs as a result of homologous pairs lining up during metaphase is known as independent assortment and is a factor in genetic diversity. Cytokinesis is the physical process for cell division. Glycolysis is the process of breaking down sugars to generate ATP. G1 phase is the first of four phases of the cell cycle that takes place in eukaryotic cell division. Mitosis only has one metaphase, since the question stem indicates metaphase I, we know that the overall process is meiosis, during which there are two cell divisions.

Example Question #165 : Cellular Division

Which process produces four genetically different haploid cells?

Possible Answers:

Transcription

Meiosis

Mitosis

Translation

Correct answer:

Meiosis

Explanation:

Meiosis produces four genetically different haploid cells, which have half the chromosomes of diploid cells. Diploid cells are produced by mitosis. Transcription produces messenger RNA, and translation produces a chain of amino acids that is protein.

Example Question #164 : Cellular Division

What is not a similarity between mitosis and meiosis?

Possible Answers:

They both result in daughter cells with half of the number of copied chromosomes of the parent cells.

DNA is replicated and later separated into two daughter cells.

Microtubules are used in forming the mitotic spindle.

Problems can occur in both processes, such as nondisjunction.

They are both forms of cellular division.

Correct answer:

They both result in daughter cells with half of the number of copied chromosomes of the parent cells.

Explanation:

Only meiosis produces daughter cells that have half the number of copied chromosomes as the parent cells. This occurs in meiosis II and the importance of having daughter cells that are haploid is that fusion of those cells during sexual reproduction will create a cell with a normal amount of copied chromosomes (diploid), not more or less. Since mitosis deals with asexual reproduction there is no need to make haploid daughter cells.

Mitosis and meiosis, then, are two forms of cellular division and like all processes they can have problems.

DNA is both replicated (interphase) and pulled apart (anaphase) in both processes. Meiosis just goes through the cycle an additional time.

Finally, microtubules are the main component in the mitotic spindle for both meiosis and mitosis.

Example Question #162 : Cellular Division

What is the difference between anaphase I and anaphase II?

Possible Answers:

During anaphase I, the sister chromatids separate from each other and in anaphase II the pair of homologous chromosomes separate from each other.

During anaphase I, the chromosomes line up along the metaphase plate and in anaphase II, the chromosomes separate from each other.

During anaphase I, the pair of homologous chromosomes separate from each other and then in anaphase II the sister chromatids separate from each other.

There are no differences between the two.

During anaphase I, the pair of homologous chromosomes separate from each other and then in anaphase II a different pair of homologous chromosomes separate from each other.

Correct answer:

During anaphase I, the pair of homologous chromosomes separate from each other and then in anaphase II the sister chromatids separate from each other.

Explanation:

During anaphase I, it is just like mitosis. There is a pair of homologous chromosomes (two X's) and they separate into two daughter cells. Anaphase II is a continuation of cellular division so instead of separating a pair of homologous chromosomes it separates sister chromatids of one chromosome (one X) into two daughter cells.

Example Question #165 : Cellular Division

What is the correct order of meiosis?

Possible Answers:

1. Prophase I, prophase II, metaphase I, metaphase II.

2. Anaphase I, anaphase II, telophase I, telophase II.

1. Prophase I, metaphase I, anaphase I, telophase I.

2. Prophase II, metaphase II, anaphase II, telophase II.

1. Prophase II, metaphase II, anaphase II, telophase II.

2. Prophase I, metaphase I, anaphase I, telophase I.

1. Prophase I, metaphase I, telophase I, anaphase I.

2. Prophase II, metaphase II, telophase II, anaphase II.

1. Prophase , metaphase, anaphase, telophase.

2. Prophase, metaphase, anaphase, telophase.

Correct answer:

1. Prophase I, metaphase I, anaphase I, telophase I.

2. Prophase II, metaphase II, anaphase II, telophase II.

Explanation:

The stages of meiosis are just like mitosis except that the division is done twice for every cell and that there are roman numerals for each division (I = 2n to 2n, II = 2n to n).

Overall, there will be four daughter cells for each parent cell in meiosis. For mitosis there are only two daughter cells for each parent cell.

Example Question #1 : Understand Pyruvate Decarboxylation

During pyruvate decarboxylation reaction, pyruvate is converted to _______________ compound, through a reaction called ______________ .

Possible Answers:

acetyl CoA; reductive decarboxylation

acetyl CoA; oxidative decarboxylation

ATP; decomposition

NADH; oxidative decarboxylation

Correct answer:

acetyl CoA; oxidative decarboxylation

Explanation:

Pyruvate decarboxylation is an oxidative decarboxylation reaction, or an oxidation reaction where a carboxylate group is removed. This reaction converts pyruvate which was produced through glycolysis to acetyl CoA to be used in the Citric Acid Cycle.

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