Question 1

You are examining the rapidly dividing cells of a fish embryo and notice a cell that seems to contain two nuclei with complete nuclear envelopes and decondensing chromosomes.The middle of the cell is pinched inward.This cell must be in

Accepted Answer

A)   prophase.
B)   telophase.
C)   metaphase.
D)   anaphase.E) B) and D)
F) B) and C)

Question 2

Which of the following processes must occur before cell division begins?

Accepted Answer

A)   shrinkage of the nucleus
B)   DNA synthesis
C)   cytokinesis
D)   DNA segregationE) A) and C)
F) A) and B)

Question 3

The goal of ________ is to increase genetic diversity by creating a new diploid individual from haploid cells that are derived from two different individuals;the aforementioned haploid cells join together to make a zygote during a process called ________.

Accepted Answer

sexual reproduction;...

Question 4

How many sister chromatids are in a bivalent?

Accepted Answer

A)   two
B)   four
C)   eight
D)   16E) A) and D)
F) C) and D)

Question 5

Which of the following sequences correctly represents the levels of DNA packing,from simplest to most dense?

Accepted Answer

A)   DNA strand →\rarr→  chromatin  →\rarr→  chromosome
B)   chromosome  →\rarr→ chromatin  →\rarr→  DNA strand
C)   DNA strand  →\rarr→  chromosome  →\rarr→  chromatin
D)   chromatin  →\rarr→  DNA strand  →\rarr→  centromere E) A) and B)
F) A) and C)

Question 6

Gametes are produced by meiosis rather than mitosis because

Accepted Answer

A)   mitosis would produce too many sister cells.
B)   meiosis reduces the number of chromosomes so that the zygotes resulting from fertilization will have one full genome consisting of a diploid number of chromosomes.
C)   meiosis doubles the number of chromosomes so that each gamete has twice the usual number of genes.
D)   meiosis ensures that the gametes are identical to the cell that produced them.E) None of the above
F) A) and C)

Question 7

What feature distinguishes an embryo from a zygote?

Accepted Answer

A)   An embyro's cells are diploid,whereas a zygote's cells are haploid.
B)   A zygote consists of a single cell,whereas an embryo is multicellular.
C)   An embryo has not differentiated to the extent that rudimentary organs are present,whereas a zygote's cells have differentiated significantly.
D)   A zygote is generally much larger than an embryo.E) B) and C)
F) C) and D)

Question 8

Which of the following statements about why multicellular organisms need cell division is generally NOT true?

Accepted Answer

A)   As an organism matures,it needs more cells.
B)   As an organism matures,it needs different kinds of cells.
C)   As an organism matures,it needs to replace the DNA in each of its cells.
D)   As an organism matures,it needs to replace worn-out cells.E) B) and C)
F) A) and B) C

Question 9

An unduplicated chromosome contains

Accepted Answer

A)   two sister chromatids.
B)   a single molecule of double-stranded DNA combined with a large number of proteins.
C)   the cell's karyotype.
D)   its own spindle poles.E) A) and C)
F) B) and C)

Question 10

When appropriately prompted,diploid individuals of Ulva prolifera form spores that germinate to become haploid individuals.What is the most likely mechanism by which diploid individuals could be created to complete the life cycle?

Accepted Answer

A)   Haploid individuals meiotically produce egg cells and sperm cells,which subsequently fuse.
B)   Some haploid individuals undergo multiple rounds of mitosis without cytokinesis,followed by nuclear fusion.
C)   Some of these individuals differentiate to become haploid gametes and then fuse to produce a diploid zygote.
D)   Haploid individuals undergo two sequential S phases in their cell cycle to reestablish the diploid state.E) A) and B)
F) A) and C)

Question 11

Cytokinesis and mitosis are the same processes.

Accepted Answer

A) True 
 B)False

Question 12

The most critical stage of interphase for a cell that needs to undergo division is the ________ phase;if the cell does not complete this phase,it cannot undergo DNA segregation.

Accepted Answer

S,synthesi...

Question 13

The daughter cells that are produced in meiosis I are haploid.

Accepted Answer

A) True 
 B)False

Question 14

The successful union of one male gamete and one female gamete forms a new single cell known as a

Accepted Answer

A)   histone.
B)   zygote.
C)   vesicle.
D)   gametocyte.E) A) and D)
F) B) and C)

Question 15

During anaphase I of meiosis,which of the following things happens?

Accepted Answer

A)   Sister chromatids are pulled apart toward opposite poles.
B)   Each member of a bivalent moves toward a different pole.
C)   All bivalents are pulled to the same pole.
D)   Paired homologues become attached to each other by microtubules.E) All of the above
F) None of the above

Question 16

The distribution of DNA into homologous pairs of chromosomes allows

Accepted Answer

A)   cells to reduce their number of chromosomes by half during meiosis.
B)   a cell to begin meiosis with only half of its DNA.
C)   sex chromosomes to exist in some cells.
D)   microtubules to attach to only half of the chromosomes.E) C) and D)
F) B) and D) A

Question 17

If a drug that inhibits the formation of microtubules is added to a culture of cells during the G2 phase,how would the cell division be affected?

Accepted Answer

A)   Cytokinesis would occur more rapidly.
B)   The nuclear envelope would be unable to break down.
C)   DNA synthesis would not occur.
D)   The spindle apparatus would be unable to form.E) B) and C)
F) A) and B) D

Question 18

Which of the following foods is most likely to contain a haploid cell or cells?

Accepted Answer

A)   a sirloin steak
B)   an apple
C)   one or more chicken eggs
D)   a stalk of celeryE) B) and D)
F) B) and C)

Question 19

During meiosis I,the microtubules from each spindle pole attach to only one member of a bivalent,generally the one closest to that spindle pole.

Accepted Answer

A) True 
 B)False

Question 20

Which of the following statements about cell division is true?

Accepted Answer

A)   It is the process by which organisms grow and maintain their tissues.
B)   It is no longer necessary after an organism reaches maturity.
C)   It occurs in two sequential stages in all cells: mitosis and meiosis.
D)   It is the process by which fertilization occurs.E) A) and B)
F) None of the above

Exam 7: Cell Division

You are examining the rapidly dividing cells of a fish embryo and notice a cell that seems to contain two nuclei with complete nuclear envelopes and decondensing chromosomes.The middle of the cell is pinched inward.This cell must be in

Correct AnswerverifiedShow Answer

Which of the following processes must occur before cell division begins?

Correct AnswerverifiedShow Answer

The goal of ________ is to increase genetic diversity by creating a new diploid individual from haploid cells that are derived from two different individuals;the aforementioned haploid cells join together to make a zygote during a process called ________.

Correct Answerverifiedsexual reproduction;...View AnswerShow Answer

How many sister chromatids are in a bivalent?

Correct AnswerverifiedShow Answer

Which of the following sequences correctly represents the levels of DNA packing,from simplest to most dense?

Correct AnswerverifiedShow Answer

Gametes are produced by meiosis rather than mitosis because

Correct AnswerverifiedShow Answer

What feature distinguishes an embryo from a zygote?

Correct AnswerverifiedShow Answer

Which of the following statements about why multicellular organisms need cell division is generally NOT true?

Correct AnswerverifiedC

An unduplicated chromosome contains

Correct AnswerverifiedShow Answer

When appropriately prompted,diploid individuals of Ulva prolifera form spores that germinate to become haploid individuals.What is the most likely mechanism by which diploid individuals could be created to complete the life cycle?

Correct AnswerverifiedShow Answer

Cytokinesis and mitosis are the same processes.

Correct AnswerverifiedShow Answer

The most critical stage of interphase for a cell that needs to undergo division is the ________ phase;if the cell does not complete this phase,it cannot undergo DNA segregation.

Correct AnswerverifiedS,synthesi...View AnswerShow Answer

The daughter cells that are produced in meiosis I are haploid.

Correct AnswerverifiedShow Answer

The successful union of one male gamete and one female gamete forms a new single cell known as a

Correct AnswerverifiedShow Answer

During anaphase I of meiosis,which of the following things happens?

Correct AnswerverifiedShow Answer

The distribution of DNA into homologous pairs of chromosomes allows

Correct AnswerverifiedA

If a drug that inhibits the formation of microtubules is added to a culture of cells during the G2 phase,how would the cell division be affected?

Correct AnswerverifiedD

Which of the following foods is most likely to contain a haploid cell or cells?

Correct AnswerverifiedShow Answer

During meiosis I,the microtubules from each spindle pole attach to only one member of a bivalent,generally the one closest to that spindle pole.

Correct AnswerverifiedShow Answer

Which of the following statements about cell division is true?

Correct AnswerverifiedShow Answer

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The goal of is to increase genetic diversity by creating a new diploid individual from haploid cells that are derived from two different individuals;the aforementioned haploid cells join together to make a zygote during a process called .

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sexual reproduction;...
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C

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A

If a drug that inhibits the formation of microtubules is added to a culture of cells during the G₂phase,how would the cell division be affected?

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D

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