Question 1

The following graph represents the concentration of cyclins over the course of the cell cycle.Which of the following statements is TRUE regarding the cell cycle where the red arrow is pointing?

Accepted Answer

A)  CDK proteins are actively phosphorylating proteins that are involved in DNA replication
B)  CDK proteins are actively phosphorylating proteins that are responsible for assembling the mitotic spindle
C)  CDK proteins are actively phosphorylating and activating cyclins so that the cell will prepare to replicate its DNA
D)  CDK proteins are actively phosphorylating and activating cyclins so that the cell will properly assemble the spindle apparatus
E)  CDK proteins are actively phosphorylating regions of the DNA that need to be targeted for DNA repair

Question 2

The formation of the bivalent during meiosis

Accepted Answer

A)  is required for the pairing of nonhomologous chromosomes.
B)  contributes to the genetic diversity of a species.
C)  ensures that the resulting haploid cells will have the same combination of homologous chromosomes as the original diploid cell.
D)  aids the alignment of sister chromatids in a single row along the metaphase plate.
E)  occurs during meiosis I and meiosis II.

Question 3

The centromere

Accepted Answer

A)  is a region of DNA where sister chromatids associate.
B)  is a group of proteins that attach to the kinetochore.
C)  is only present when chromosomes are highly compacted.
D)  is a group of proteins that attach to the mitotic spindle.
E)  is not present on the chromosomes of the daughter cells until the S phasE.

Question 4

Consider a cell in which all of the homologous chromosomes experience nondisjunction during meiosis I.What would be the result of this event?

Accepted Answer

A)  two polyploid gametes
B)  one trisomic and three monosomic gametes
C)  four aneuploid gametes
D)  four monosomic gametes
E)  four aneuploid gametes: one trisomic and three monosomic

Question 5

Which of the following statements about sister chromatids is TRUE?

Accepted Answer

A)  Sister chromatids are produced during mitosis
B)  Sister chromatids are held together by complementary base pairing of DNA at the centromere
C)  Sister chromatids are exact copies of each other
D)  Sister chromatids contain the same genes,but they may have different alleles
E)  All of these statements about sister chromatids are TRUE

Question 6

A cell undergoing meiosis that contains sister chromatids may be either haploid or diploid.

Accepted Answer

A) True 
 B)False

Question 7

Which of the following is NOT an accurate description of a checkpoint that controls the progression of the cell cycle?

Accepted Answer

A)  During the G1 checkpoint,cyclin and cyclin-dependent kinases combine to form complexes that activate proteins involved in DNA replication.
B)  The G2 checkpoint checks for DNA damage and determines if all of the DNA is replicated.
C)  The metaphase checkpoint determines if all chromosomes are attached to the spindle apparatus.
D)  Cytokinesis involves the formation of cleavage furrow to separate the cells.
E)  The G1 checkpoint determines if conditions are favorable for cell division and if the DNA is undamaged.

Question 8

Polyploidy in plants

Accepted Answer

A)  is common.
B)  allows for adaptation to diverse environments.
C)  may alter the levels of gene expression.
D)  may result in larger individuals.
E)  All of these statements are true regarding polyploidy in plants. E

Question 9

Homologous chromosomes are identical copies of each other.

Accepted Answer

A) True 
 B)False

Question 10

At the end of meiosis I

Accepted Answer

A)  cells are haploid.
B)  cells are diploid.
C)  the homologous pairs are in separate cells.
D)  the cells are diploid and the homologous pairs are in separate cells.
E)  the cells are haploid and the homologous pairs are in separate cells.

Question 11

Cytogenetics is

Accepted Answer

A)  a photographic representation of chromosome.
B)  the field of genetics that involves the microscopic examination of the chromosomes and cell division.
C)  the sorting process to divide one cell nucleus into two nuclei.
D)  the process in which the two nuclei are segregated into separate daughter cells.
E)  the process by which the haploid cells are produced from a cell that was originally diploid.

Question 12

The life cycle of a sexually reproducing organism must includes which processes?

Accepted Answer

A)  mitosis and meiosis.
B)  mitosis,meiosis,and fusion of the gametes.
C)  meiosis and fusion of gametes
D)  only mitosis
E)  only meiosis

Question 13

The major way that meiosis II differs from mitosis is that

Accepted Answer

A)  in meiosis II,the homologous sister chromatids align at the metaphase plate as a tetrad.
B)  in meiosis II,a pair of sister chromatids move to the pole.
C)  in meiosis II,the cells are haploid.
D)  in meiosis II,a synaptonemal complex is formeD.
E)  in meiosis II,the homologues separatE.

Question 14

The karyotype of a normal human male would show a total of 23 pairs of homologous chromosomes.

Accepted Answer

A) True 
 B)False

Question 15

Consider a diploid species where n=5.If an individual of this species was found to have 11 chromosomes,it would be categorized as

Accepted Answer

A)  polyploid.
B)  aneuploid.
C)  tetraploid.
D)  monosomic.
E)  triploid. B

Question 16

In a tetraploid species,how many sets of chromosomes would a euploid individual possess?

Accepted Answer

A)  2
B)  4
C)  6
D)  8
E)  2n+2

Question 17

During crossing over in meiosis,an incomplete exchange of genetic material occurs.This would most likely produce

Accepted Answer

A)  a deficiency in one homologue and a duplication in the other homologue.
B)  a deficiency in both homologues.
C)  a deficiency in one homologue and an inversion in the other homologue.
D)  a reciprocal translocation.
E)  a duplication in one homologue and an inversion in the other homologuE. A

Question 18

Most human embryos that are aneuploid

Accepted Answer

A)  result in Down's syndrome.
B)  result in sterility.
C)  are spontaneously aborted in the first trimester.
D)  can develop and survive to adulthooD.
E)  are usually the result of increased nondisjunction in the gametes of older men.

Question 19

For any given species,cells in metaphase II of meiosis would contain 2* more genetic material than cells in metaphase of mitosis.

Accepted Answer

A) True 
 B)False

Question 20

Which of the following statements about the cell cycle is correct?

Accepted Answer

A)  The cell cycle is a sequence of replications and divisions that produces numerous new cells.
B)  The phases of the cell cycle are G1,S,and M phases.
C)  In actively dividing cells,the S and G2 phases are collectively known as interphase.
D)  When the S phase of the cell cycle is finished,a cell has twice as much DNA as it did during the G1 phase.
E)  During G2 phase,the cell grows and copies its chromosomes in preparation for cell division.

Exam 13: The Eukaryotic Cell Cycle, Mitosis, and Meiosis

The following graph represents the concentration of cyclins over the course of the cell cycle.Which of the following statements is TRUE regarding the cell cycle where the red arrow is pointing?

Correct AnswerverifiedShow Answer

The formation of the bivalent during meiosis

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The centromere

Correct AnswerverifiedShow Answer

Consider a cell in which all of the homologous chromosomes experience nondisjunction during meiosis I.What would be the result of this event?

Correct AnswerverifiedShow Answer

Which of the following statements about sister chromatids is TRUE?

Correct AnswerverifiedShow Answer

A cell undergoing meiosis that contains sister chromatids may be either haploid or diploid.

Correct AnswerverifiedShow Answer

Which of the following is NOT an accurate description of a checkpoint that controls the progression of the cell cycle?

Correct AnswerverifiedShow Answer

Polyploidy in plants

Correct AnswerverifiedE

Homologous chromosomes are identical copies of each other.

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At the end of meiosis I

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Cytogenetics is

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The life cycle of a sexually reproducing organism must includes which processes?

Correct AnswerverifiedShow Answer

The major way that meiosis II differs from mitosis is that

Correct AnswerverifiedShow Answer

The karyotype of a normal human male would show a total of 23 pairs of homologous chromosomes.

Correct AnswerverifiedShow Answer

Consider a diploid species where n=5.If an individual of this species was found to have 11 chromosomes,it would be categorized as

Correct AnswerverifiedB

In a tetraploid species,how many sets of chromosomes would a euploid individual possess?

Correct AnswerverifiedShow Answer

During crossing over in meiosis,an incomplete exchange of genetic material occurs.This would most likely produce

Correct AnswerverifiedA

Most human embryos that are aneuploid

Correct AnswerverifiedShow Answer

For any given species,cells in metaphase II of meiosis would contain 2* more genetic material than cells in metaphase of mitosis.

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Which of the following statements about the cell cycle is correct?

Correct AnswerverifiedShow Answer

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E

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B

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A

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