Question 1

Which of the following are primarily responsible for cytokinesis in plant cells but not in animal cells?

Accepted Answer

A) kinetochores 
B) Golgi-derived vesicles 
C) actin and myosin 
D) centrioles and centromeres 
E) cyclin-dependent kinases 
A) kinetochores 
B) Golgi-derived vesicles 
C) actin and myosin 
D) centrioles and centromeres 
E) cyclin-dependent kinases B

Question 2

The cyclin component of MPF is destroyed toward the end of which phase?

Accepted Answer

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

Question 3

The following questions are based on the following figure.
  
-Which number represents the point in the cell cycle during which the chromosomes are replicated?

Accepted Answer

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

Question 4

Use the data in the table below to answer the following questions.
The data 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.
   
Minutes Spent in Cell Cycle Phases
-Of the following, the best conclusion concerning the difference between the S phases for beta and gamma is that

Accepted Answer

A) gamma contains more DNA than beta. 
B) beta and gamma contain the same amount of DNA. 
C) beta cells reproduce asexually. 
D) gamma contains 48 times more DNA and RNA than beta. 
E) beta is a plant cell and gamma is an animal cell. 
A) gamma contains more DNA than beta. 
B) beta and gamma contain the same amount of DNA. 
C) beta cells reproduce asexually. 
D) gamma contains 48 times more DNA and RNA than beta. 
E) beta is a plant cell and gamma is an animal cell.

Question 5

The following questions are based on the following figure.
  
-At which of the numbered regions would you expect to find cells at metaphase?

Accepted Answer

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

Question 6

Which of the following describe(s)cyclin-dependent kinase (Cdk)?

Accepted Answer

A) Cdk is inactive, or "turned off," in the presence of cyclin. 
B) Cdk is present throughout the cell cycle. 
C) Cdk is an enzyme that attaches phosphate groups to other proteins. 
D) Cdk is inactive, or "turned off," in the presence of cyclin and it is present throughout the cell cycle. 
E) Cdk is present throughout the cell cycle and is an enzyme that attaches phosphate groups to other proteins. 
A) Cdk is inactive, or "turned off," in the presence of cyclin. 
B) Cdk is present throughout the cell cycle. 
C) Cdk is an enzyme that attaches phosphate groups to other proteins. 
D) Cdk is inactive, or "turned off," in the presence of cyclin and it is present throughout the cell cycle. 
E) Cdk is present throughout the cell cycle and is an enzyme that attaches phosphate groups to other proteins.

Question 7

For a chemotherapeutic drug to be useful for treating cancer cells, which of the following is most desirable?

Accepted Answer

A) It is safe enough to limit all apoptosis. 
B) It does not alter metabolically active cells. 
C) It only attacks cells that are density dependent. 
D) It interferes with cells entering G₀. 
E) It interferes with rapidly dividing cells. 
A) It is safe enough to limit all apoptosis. 
B) It does not alter metabolically active cells. 
C) It only attacks cells that are density dependent. 
D) It interferes with cells entering G₀. 
E) It interferes with rapidly dividing cells.

Question 8

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 did the nucleus contain 6 picograms of DNA?

Accepted Answer

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

Question 9

In which group of eukaryotic organisms does the nuclear envelope remain intact during mitosis?

Accepted Answer

A) seedless plants 
B) dinoflagellates 
C) diatoms 
D) dinoflagellates and diatoms only 
E) seedless plants, dinoflagellates, and diatoms 
A) seedless plants 
B) dinoflagellates 
C) diatoms 
D) dinoflagellates and diatoms only 
E) seedless plants, dinoflagellates, and diatoms

Question 10

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

Question 11

Using which of the following techniques would enable your lab group to distinguish between a cell in G₂ and a cell from the same organism in G₁?

Accepted Answer

A) fluorescence microscopy 
B) electron microscopy 
C) spectrophotometry 
D) radioactive-labelled nucleotides 
E) labelled kinetochore proteins 
A) fluorescence microscopy 
B) electron microscopy 
C) spectrophotometry 
D) radioactive-labelled nucleotides 
E) labelled kinetochore proteins

Question 12

Use the following information to answer the questions below.
Nucleotides can be radiolabelled before they are incorporated into newly forming DNA and can therefore be assayed to track their incorporation. In a set of experiments, a student-faculty research team used labelled T nucleotides and introduced these into the culture of dividing human cells at specific times.
-Which of the following questions might be answered by such a method?

Accepted Answer

A) How many cells are produced by the culture per hour? 
B) What is the length of the S phase of the cell cycle? 
C) When is the S chromosome synthesized? 
D) How many picograms of DNA are made per cell cycle? 
E) When do spindle fibres attach to chromosomes? 
A) How many cells are produced by the culture per hour? 
B) What is the length of the S phase of the cell cycle? 
C) When is the S chromosome synthesized? 
D) How many picograms of DNA are made per cell cycle? 
E) When do spindle fibres attach to chromosomes?

Question 13

Which of the following is released by platelets in the vicinity of an injury?

Accepted Answer

A) PDGF 
B) MPF 
C) protein kinase 
D) cyclin 
E) Cdk 
A) PDGF 
B) MPF 
C) protein kinase 
D) cyclin 
E) Cdk

Question 14

For anaphase to begin, which of the following must occur?

Accepted Answer

A) Chromatids must lose their kinetochores. 
B) Cohesin must attach the sister chromatids to each other. 
C) Cohesin must be cleaved enzymatically. 
D) Kinetochores must attach to the metaphase plate. 
E) Spindle microtubules must begin to depolymerize. 
A) Chromatids must lose their kinetochores. 
B) Cohesin must attach the sister chromatids to each other. 
C) Cohesin must be cleaved enzymatically. 
D) Kinetochores must attach to the metaphase plate. 
E) Spindle microtubules must begin to depolymerize.

Question 15

The following questions are based on the following figure.
  
-Which number represents DNA synthesis?

Accepted Answer

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

Question 16

One difference between cancer cells and normal cells is that cancer cells

Accepted Answer

A) are unable to synthesize DNA. 
B) are arrested at the S phase of the cell cycle. 
C) continue to divide even when they are tightly packed together. 
D) cannot function properly because they are affected by density-dependent inhibition. 
E) are always in the M phase of the cell cycle. 
A) are unable to synthesize DNA. 
B) are arrested at the S phase of the cell cycle. 
C) continue to divide even when they are tightly packed together. 
D) cannot function properly because they are affected by density-dependent inhibition. 
E) are always in the M phase of the cell cycle.

Question 17

Use the following information to answer the questions below.
You observe cells under the microscope and notice that, while in telophase, small vesicles line up along the middle of the cell.
-The event that you are witnessing is

Accepted Answer

A) cytokinesis. 
B) cleavage. 
C) meiosis. 
D) apoptosis. 
E) binary fission. 
A) cytokinesis. 
B) cleavage. 
C) meiosis. 
D) apoptosis. 
E) binary fission.

Question 18

Use the following information to answer the questions below.
You observe cells under the microscope and notice that, while in telophase, small vesicles line up along the middle of the cell.
-Through a microscope, you can see a cell plate beginning to develop across the middle of a cell and nuclei forming on either side of the cell plate. This cell is most likely

Accepted Answer

A) an animal cell in the process of cytokinesis. 
B) a plant cell in the process of cytokinesis. 
C) an animal cell in the S phase of the cell cycle. 
D) a bacterial cell dividing. 
E) a plant cell in metaphase. 
A) an animal cell in the process of cytokinesis. 
B) a plant cell in the process of cytokinesis. 
C) an animal cell in the S phase of the cell cycle. 
D) a bacterial cell dividing. 
E) a plant cell in metaphase.

Question 19

A particular cyclin called cyclin E forms a complex with Cdk 2 (cyclin-dependent kinase 2). This complex is important for the progression of the cell from G₁ into the S phase of the cell cycle. Which of the following statements is correct?

Accepted Answer

A) The amount of free cyclin E is greatest during the S phase. 
B) The amount of free Cdk 2 is greater during G₁ compared to the S phase. 
C) The amount of free cyclin E is highest during G₁. 
D) The amount of free Cdk 2 is greatest during G₁. 
E) The activity of the cyclin E/Cdk 2 complex is highest during G₂. 
A) The amount of free cyclin E is greatest during the S phase. 
B) The amount of free Cdk 2 is greater during G₁ compared to the S phase. 
C) The amount of free cyclin E is highest during G₁. 
D) The amount of free Cdk 2 is greatest during G₁. 
E) The activity of the cyclin E/Cdk 2 complex is highest during G₂.

Question 20

What explains anchorage dependence of animal cells in vitro or in vivo?

Accepted Answer

A) attachment of spindle fibres to centrioles 
B) response of the plasma membrane to cell cycle controls 
C) the makeup of the extracellular matrix of the substrate 
D) the binding of cell-surface phospholipids to those of adjoining cells 
E) the binding of cell-surface phospholipids to the substrate 
A) attachment of spindle fibres to centrioles 
B) response of the plasma membrane to cell cycle controls 
C) the makeup of the extracellular matrix of the substrate 
D) the binding of cell-surface phospholipids to those of adjoining cells 
E) the binding of cell-surface phospholipids to the substrate

Exam 12: The Cell Cycle

Which of the following are primarily responsible for cytokinesis in plant cells but not in animal cells?

The cyclin component of MPF is destroyed toward the end of which phase?

The following questions are based on the following figure. -Which number represents the point in the cell cycle during which the chromosomes are replicated?

The following questions are based on the following figure. -At which of the numbered regions would you expect to find cells at metaphase?

Which of the following describe(s)cyclin-dependent kinase (Cdk)?

For a chemotherapeutic drug to be useful for treating cancer cells, which of the following is most desirable?

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 did the nucleus contain 6 picograms of DNA?

In which group of eukaryotic organisms does the nuclear envelope remain intact during mitosis?

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

Using which of the following techniques would enable your lab group to distinguish between a cell in G₂ and a cell from the same organism in G₁?

Which of the following is released by platelets in the vicinity of an injury?

For anaphase to begin, which of the following must occur?

The following questions are based on the following figure. -Which number represents DNA synthesis?

One difference between cancer cells and normal cells is that cancer cells

Use the following information to answer the questions below. You observe cells under the microscope and notice that, while in telophase, small vesicles line up along the middle of the cell. -The event that you are witnessing is

A particular cyclin called cyclin E forms a complex with Cdk 2 (cyclin-dependent kinase 2). This complex is important for the progression of the cell from G₁ into the S phase of the cell cycle. Which of the following statements is correct?

What explains anchorage dependence of animal cells in vitro or in vivo?

Introduction: Evolution and Themes of Biology

The Chemical Context of Life

Water and Life

Carbon and the Molecular Diversity of Life

The Structure and Function of Large Biological Molecules

A Tour of the Cell

Membrane Structure and Function

An Introduction to Metabolism

Cellular Respiration and Fermentation

Photosynthesis

Cell Communication

Meiosis and Sexual Life Cycles

Mendel and the Gene Idea

The Chromosomal Basis of Inheritance

The Molecular Basis of Inheritance

From Gene to Protein

Regulation of Gene Expression

Viruses

Dna Tools and Biotechnology

Genomes and Their Evolution

Descent With Modification: a Darwinian View of Life

The Evolution of Populations

The Origin of Species

The History of Life on Earth

Phylogeny and the Tree of Life

Bacteria and Archaea

Protists

Plant Diversity I: How Plants Colonized Land

Plant Diversity Ii: the Evolution of Seed Plants

Fungi

An Overview of Animal Diversity

An Introduction to Invertebrates

The Origin and Evolution of Vertebrates

Plant Structure, Growth, and Development

Resource Acquisition and Transport in Vascular Plants

Soil and Plant Nutrition

Angiosperm Reproduction and Biotechnology

Plant Responses to Internal and External Signals

Basic Principles of Animal Form and Function

Animal Nutrition

Circulation and Gas Exchange

The Immune System

Osmoregulation and Excretion

Hormones and the Endocrine System

Animal Reproduction

Animal Development

Neurons, Synapses, and Signalling

Nervous Systems

Sensory and Motor Mechanisms

Animal Behaviour

An Introduction to Ecology and the Biosphere

Population Ecology

Community Ecology

Ecosystems and Restoration Ecology

Conservation Biology and Global Change

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