Question 1

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. 
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. C

Question 2

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. 
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. A

Question 3

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. 
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. D

Question 4

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 5

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. 
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.

Question 6

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 7

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 
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

Question 8

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 segregation 
A)  shrinkage of the nucleus 
B)  DNA synthesis 
C)  cytokinesis 
D)  DNA segregation

Question 9

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. 
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.

Question 10

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. 
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.

Question 11

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. 
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.

Question 12

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

Accepted Answer

A) True 
 B)False

Question 13

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. 
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.

Question 14

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 15

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. 
A)  histone. 
B)  zygote. 
C)  vesicle. 
D)  gametocyte.

Question 16

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

Question 17

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. 
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.

Question 18

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. 
A)  prophase. 
B)  telophase. 
C)  metaphase. 
D)  anaphase.

Question 19

Cytokinesis and mitosis are the same processes.

Accepted Answer

A) True 
 B)False

Question 20

How many sister chromatids are in a bivalent?

Accepted Answer

A)  two 
B)  four 
C)  eight 
D)  16 
A)  two 
B)  four 
C)  eight 
D)  16

Exam 7: Cell Division

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

The distribution of DNA into homologous pairs of chromosomes allows

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?

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.

An unduplicated chromosome contains

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.

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

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

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

What feature distinguishes an embryo from a zygote?

Gametes are produced by meiosis rather than mitosis because

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

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?

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 ________.

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

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

Which of the following statements about cell division is true?

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

Cytokinesis and mitosis are the same processes.

How many sister chromatids are in a bivalent?

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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?

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 .