Question 1

Which is the first checkpoint in the cell cycle where a cell will be caused to exit the cycle if this point is not passed?

Accepted Answer

A)  G0 
B)  G1 
C)  G2 
D)  S 
E)  M 
A)  G0 
B)  G1 
C)  G2 
D)  S 
E)  M B

Question 2

Please use the following information to answer the question(s) below.
The data in Table 9.1 were obtained from a study of the length of time spent in each phase of the cell cycle by cells of three eukaryotic organisms designated beta, delta, and gamma.   Table 9.1
Minutes Spent in Cell Cycle Phases
-The best conclusion concerning delta is that the cells

Accepted Answer

A)  contain no DNA. 
B)  contain only one chromosome that is very small. 
C)  are actually in the G0 phase. 
D)  synthesize DNA in the G1 phase 
A)  contain no DNA. 
B)  contain only one chromosome that is very small. 
C)  are actually in the G0 phase. 
D)  synthesize DNA in the G1 phase C

Question 3

A plant-derived protein known as colchicine can be used to poison cells by blocking the formation of the spindle. Which of the following would result if colchicine is added to a sample of cells in G2?

Accepted Answer

A)  The cells would immediately die. 
B)  The cells would be unable to begin M and stay in G2. 
C)  The chromosomes would segregate but in a disorderly pattern. 
D)  Chromosome condensation would occur, but the chromosomes would fail to align at the metaphase plate. 
A)  The cells would immediately die. 
B)  The cells would be unable to begin M and stay in G2. 
C)  The chromosomes would segregate but in a disorderly pattern. 
D)  Chromosome condensation would occur, but the chromosomes would fail to align at the metaphase plate. C

Question 4

Figure 9.2
If the cell whose nuclear material is shown in Figure 9.2 continues toward completion of mitosis, which of the following events would occur next?

Accepted Answer

A)  cell membrane synthesis 
B)  alignment of chromosomes at the metaphase plate 
C)  segregation of daughter chromosomes toward the poles 
D)  formation of telophase nuclei 
E)  synthesis of sister chromatids 
A)  cell membrane synthesis 
B)  alignment of chromosomes at the metaphase plate 
C)  segregation of daughter chromosomes toward the poles 
D)  formation of telophase nuclei 
E)  synthesis of sister chromatids

Question 5

Measurements of the amount of DNA per nucleus were taken on a large number of cells from a growing fungus. The measured DNA levels ranged from 3 to 6 picograms per nucleus. In which stage of the cell cycle would the nucleus contain 6 picograms of DNA?

Accepted Answer

A)  G0 
B)  G1 
C)  S 
D)  G2 
A)  G0 
B)  G1 
C)  S 
D)  G2

Question 6

A group of cells is assayed for DNA content immediately before beginning mitosis and is found to have an average of 16 picograms of DNA per nucleus. How many picograms would be in a cell nucleus following completion of mitosis and cytokinesis?

Accepted Answer

A)  4 
B)  8 
C)  16 
D)  32 
A)  4 
B)  8 
C)  16 
D)  32

Question 7

Humans produce skin cells by mitosis and gametes by meiosis. The nuclei of skin cells produced by mitosis will have

Accepted Answer

A)  half as much DNA as the nuclei of gametes produced by meiosis. 
B)  the same amount of DNA as the nuclei of gametes produced by meiosis. 
C)  twice as much DNA as the nuclei of gametes produced by meiosis. 
D)  four times as much DNA as the nuclei of gametes produced by meiosis. 
A)  half as much DNA as the nuclei of gametes produced by meiosis. 
B)  the same amount of DNA as the nuclei of gametes produced by meiosis. 
C)  twice as much DNA as the nuclei of gametes produced by meiosis. 
D)  four times as much DNA as the nuclei of gametes produced by meiosis.

Question 8

Eukaryotic chromatin is composed of

Accepted Answer

A)  condensed DNA only. 
B)  DNA and RNA. 
C)  DNA and carbohydrates. 
D)  DNA and proteins. 
E)  DNA and ribosomes. 
A)  condensed DNA only. 
B)  DNA and RNA. 
C)  DNA and carbohydrates. 
D)  DNA and proteins. 
E)  DNA and ribosomes.

Question 9

Please use the following information to answer the question(s) below.
The data in Table 9.1 were obtained from a study of the length of time spent in each phase of the cell cycle by cells of three eukaryotic organisms designated beta, delta, and gamma.   Table 9.1
Minutes Spent in Cell Cycle Phases
-Which of the following is the most plausible explanation for the difference in time spent in S phase by beta and gamma?

Accepted Answer

A)  Gamma is unicellular and beta is multicellular. 
B)  Beta is tetraploid and gamma is diploid. 
C)  Gamma contains more DNA than beta. 
D)  Beta reproduces asexually and gamma reproduces sexually. 
E)  Beta is a plant cell and gamma is an animal cell. 
A)  Gamma is unicellular and beta is multicellular. 
B)  Beta is tetraploid and gamma is diploid. 
C)  Gamma contains more DNA than beta. 
D)  Beta reproduces asexually and gamma reproduces sexually. 
E)  Beta is a plant cell and gamma is an animal cell.

Question 10

The drug cytochalasin B blocks the function of actin. Which of the following aspects of the animal cell cycle would be most-disrupted by cytochalasin B?

Accepted Answer

A)  spindle formation 
B)  spindle attachment to kinetochores 
C)  cell elongation during anaphase 
D)  cleavage furrow formation and cytokinesis 
A)  spindle formation 
B)  spindle attachment to kinetochores 
C)  cell elongation during anaphase 
D)  cleavage furrow formation and cytokinesis

Question 11

During mitosis in animal cells, at which phase do centrioles begin to move apart?

Accepted Answer

A)  prophase 
B)  prometaphase 
C)  metaphase 
D)  anaphase 
E)  telophase 
A)  prophase 
B)  prometaphase 
C)  metaphase 
D)  anaphase 
E)  telophase

Question 12

You have the technology necessary to measure each of the following in a sample of animal cells: chlorophylls, organelle density, picograms of DNA, cell wall components, and enzymatic activity. Which would you expect to increase significantly from M to G1?

Accepted Answer

A)  organelle density and enzymatic activity 
B)  cell wall components and DNA 
C)  chlorophyll and cell walls 
D)  organelle density and cell walls 
E)  chlorophyll and DNA 
A)  organelle density and enzymatic activity 
B)  cell wall components and DNA 
C)  chlorophyll and cell walls 
D)  organelle density and cell walls 
E)  chlorophyll and DNA

Question 13

Figure 9.3
-In Figure 9.3, G2 is represented by which numbered parts of the cycle?

Accepted Answer

A)  I or V 
B)  II or IV 
C)  III only 
D)  IV only 
E)  V only 
A)  I or V 
B)  II or IV 
C)  III only 
D)  IV only 
E)  V only

Question 14

You have a series of cells, all of which were derived from tumors. How might you determine which ones are malignant?

Accepted Answer

A)  Identify the ones that are not dividing uncontrollably. 
B)  Identify the ones with higher rates of apoptosis. 
C)  Prepare karyotypes to identify the ones with aberrant chromosome number or structure. 
D)  Identify the ones with elongated cell cycles. 
A)  Identify the ones that are not dividing uncontrollably. 
B)  Identify the ones with higher rates of apoptosis. 
C)  Prepare karyotypes to identify the ones with aberrant chromosome number or structure. 
D)  Identify the ones with elongated cell cycles.

Question 15

If there are 20 centromeres in a cell at anaphase of mitosis, how many chromosomes are there in each daughter cell following cytokinesis?

Accepted Answer

A)  5 
B)  10 
C)  20 
D)  40 
A)  5 
B)  10 
C)  20 
D)  40

Question 16

Please use the following information to answer the question(s) below.
The unlettered circle at the top of Figure 9.1 shows a diploid nucleus with four chromosomes that have not yet replicated. There are two pairs of homologous chromosomes, one long and the other short. One haploid set is black, and the other is gray. The circles labeled A-E show various combinations of these chromosomes.   Figure 9.1
-What is the correct chromosomal condition for a nucleus at prophase of mitosis?

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
E)  E 
A)  A 
B)  B 
C)  C 
D)  D 
E)  E

Question 17

A particular cell has half as much DNA as some other cells in a mitotically active tissue. The cell in question is most likely in

Accepted Answer

A)  G1. 
B)  G2. 
C)  prophase. 
D)  metaphase. 
A)  G1. 
B)  G2. 
C)  prophase. 
D)  metaphase.

Question 18

Which of the following does not occur during mitosis?

Accepted Answer

A)  condensation of the chromosomes 
B)  replication of the DNA 
C)  separation of sister chromatids 
D)  spindle formation 
A)  condensation of the chromosomes 
B)  replication of the DNA 
C)  separation of sister chromatids 
D)  spindle formation

Question 19

Compared to most prokaryotic cells, eukaryotic cells typically have

Accepted Answer

A)  more DNA molecules and larger genomes. 
B)  the same number of DNA molecules but larger genomes. 
C)  the same number of DNA molecules and similarly sized genomes. 
D)  fewer DNA molecules but larger genomes. 
E)  fewer DNA molecules and smaller genomes. 
A)  more DNA molecules and larger genomes. 
B)  the same number of DNA molecules but larger genomes. 
C)  the same number of DNA molecules and similarly sized genomes. 
D)  fewer DNA molecules but larger genomes. 
E)  fewer DNA molecules and smaller genomes.

Question 20

Please use the following information to answer the question(s) below.
The data in Table 9.1 were obtained from a study of the length of time spent in each phase of the cell cycle by cells of three eukaryotic organisms designated beta, delta, and gamma.   Table 9.1
Minutes Spent in Cell Cycle Phases
-Several organisms, including a number of protists, have intermediate mitotic organization. Which of the following is the most probable hypothesis regarding these intermediate forms of cell division?

Accepted Answer

A)  They represent a form of cell reproduction that must have evolved completely separately from those of other organisms. 
B)  They demonstrate that these species are not closely related to any of the other protists and may well be a different kingdom. 
C)  They rely on totally different proteins for the processes they undergo. 
D)  They may be more closely related to plant forms that also have unusual mitosis. 
E)  They show some but not all of the evolutionary steps toward complete mitosis. 
A)  They represent a form of cell reproduction that must have evolved completely separately from those of other organisms. 
B)  They demonstrate that these species are not closely related to any of the other protists and may well be a different kingdom. 
C)  They rely on totally different proteins for the processes they undergo. 
D)  They may be more closely related to plant forms that also have unusual mitosis. 
E)  They show some but not all of the evolutionary steps toward complete mitosis.

Exam 9: The Cell Cycle

Which is the first checkpoint in the cell cycle where a cell will be caused to exit the cycle if this point is not passed?

A plant-derived protein known as colchicine can be used to poison cells by blocking the formation of the spindle. Which of the following would result if colchicine is added to a sample of cells in G2?

Figure 9.2 If the cell whose nuclear material is shown in Figure 9.2 continues toward completion of mitosis, which of the following events would occur next?

Measurements of the amount of DNA per nucleus were taken on a large number of cells from a growing fungus. The measured DNA levels ranged from 3 to 6 picograms per nucleus. In which stage of the cell cycle would the nucleus contain 6 picograms of DNA?

A group of cells is assayed for DNA content immediately before beginning mitosis and is found to have an average of 16 picograms of DNA per nucleus. How many picograms would be in a cell nucleus following completion of mitosis and cytokinesis?

Humans produce skin cells by mitosis and gametes by meiosis. The nuclei of skin cells produced by mitosis will have

Eukaryotic chromatin is composed of

The drug cytochalasin B blocks the function of actin. Which of the following aspects of the animal cell cycle would be most-disrupted by cytochalasin B?

During mitosis in animal cells, at which phase do centrioles begin to move apart?

You have the technology necessary to measure each of the following in a sample of animal cells: chlorophylls, organelle density, picograms of DNA, cell wall components, and enzymatic activity. Which would you expect to increase significantly from M to G1?

Figure 9.3 -In Figure 9.3, G2 is represented by which numbered parts of the cycle?

You have a series of cells, all of which were derived from tumors. How might you determine which ones are malignant?

If there are 20 centromeres in a cell at anaphase of mitosis, how many chromosomes are there in each daughter cell following cytokinesis?

A particular cell has half as much DNA as some other cells in a mitotically active tissue. The cell in question is most likely in

Which of the following does not occur during mitosis?

Compared to most prokaryotic cells, eukaryotic cells typically have

Introduction: Evolution and the Foundations of Biology

The Chemical Context of Life

Carbon and the Molecular Diversity of Life

A Tour of the Cell

Membrane Transport and Cell Signaling

An Introduction to Metabolism

Cellular Respiration and Fermentation

Photosynthesis

Meiosis and Sexual Life Cycles

Mendel and the Gene Idea

The Chromosomal Basis of Inheritance

The Molecular Basis of Inheritance

Gene Expression: From Gene to Protein

Regulation of Gene Expression

Development, Stem Cells, and Cancer

Viruses

Genomes and Their Evolution

Descent With Modification

Phylogeny

The Evolution of Populations

The Origin of Species

Broad Patterns of Evolution

Early Life and the Diversification of Prokaryotes

The Origin and Diversification of Eukaryotes

The Colonization of Land by Plants and Fungi

The Rise of Animal Diversity

Plant Structure and Growth

Resource Acquisition, Nutrition, and Transport in Vascular Plants

Reproduction and Domestication of Flowering Plants

Plant Responses to Internal and External Signals

Homeostasis and Endocrine Signaling

Animal Nutrition

Circulation and Gas Exchange

The Immune System

Reproduction and Development

Neurons, Synapses, and Signaling

Nervous and Sensory Systems

Motor Mechanisms and Behavior

Population Ecology and the Distribution of Organisms

Species Interactions

Ecosystems and Energy

Global Ecology and Conservation Biology

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