Question 1

Use the data in the accompanying table to answer the following question(s).
-The best conclusion concerning delta is that the cells ________.

Accepted Answer

A)  contain no DNA 
B)  contain no RNA 
C)  contain only one chromosome that is very short 
D)  are in the G0 phase 
E)  divide in the G1 phase 
A)  contain no DNA 
B)  contain no RNA 
C)  contain only one chromosome that is very short 
D)  are in the G0 phase 
E)  divide in the G1 phase

Question 2

Which cytoskeletal proteins are important constituents of the contractile structures that form the cleavage furrows involved in animal cell cytokinesis?

Accepted Answer

A)  actin 
B)  dynein 
C)  tubulin 
D)  myosin 
A)  actin 
B)  dynein 
C)  tubulin 
D)  myosin

Question 3

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 4

Kinetochore microtubules assist in the process of splitting centromeres by ________.

Accepted Answer

A)  using motor proteins to split the centromere at specific arginine residues 
B)  creating tension by pulling toward opposite poles 
C)  sliding past each other like actin filaments 
D)  phosphorylating the centromere, thereby changing its conformation 
A)  using motor proteins to split the centromere at specific arginine residues 
B)  creating tension by pulling toward opposite poles 
C)  sliding past each other like actin filaments 
D)  phosphorylating the centromere, thereby changing its conformation

Question 5

Use the following information to answer the question(s) below.
Nucleotides can be radiolabeled before they are incorporated into newly forming DNA and, therefore, can be assayed to track their incorporation. In a set of experiments, a student-faculty research team used labeled T nucleotides and introduced these into the culture of dividing human cells at specific times.
-In eukaryotic cells, chromosomes are composed of ________.

Accepted Answer

A)  DNA and RNA 
B)  DNA only 
C)  DNA and proteins 
D)  DNA and phospholipids 
A)  DNA and RNA 
B)  DNA only 
C)  DNA and proteins 
D)  DNA and phospholipids

Question 6

-In the accompanying figure, MPF reaches its highest concentration during this stage.

Accepted Answer

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

Question 7

Movement of the chromosomes during anaphase would be most affected by a drug that prevents ________.

Accepted Answer

A)  nuclear envelope breakdown 
B)  cell-wall formation 
C)  elongation of microtubules 
D)  shortening of microtubules 
E)  formation of a cleavage furrow 
A)  nuclear envelope breakdown 
B)  cell-wall formation 
C)  elongation of microtubules 
D)  shortening of microtubules 
E)  formation of a cleavage furrow

Question 8

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

Question 9

If there are 20 chromatids in a cell, how many centromeres are there?

Accepted Answer

A)  10 
B)  20 
C)  30 
D)  40 
E)  80 
A)  10 
B)  20 
C)  30 
D)  40 
E)  80

Question 10

Scientists isolate cells in various phases of the cell cycle. They find a group of cells that have   times more DNA than G1 phase cells. The cells of this group are ________.

Accepted Answer

A)  between the G1 and S phases in the cell cycle 
B)  in the G2 phase of the cell cycle 
C)  in the M phase of the cell cycle 
D)  in the S phase of the cell cycle 
A)  between the G1 and S phases in the cell cycle 
B)  in the G2 phase of the cell cycle 
C)  in the M phase of the cell cycle 
D)  in the S phase of the cell cycle

Question 11

Vinblastine is a standard chemotherapeutic drug used to treat cancer. Because it interferes with the assembly of microtubules, its effectiveness must be related to ________.

Accepted Answer

A)  disruption of mitotic spindle formation 
B)  inhibition of regulatory protein phosphorylation 
C)  suppression of cyclin production 
D)  myosin denaturation and inhibition of cleavage furrow formation 
E)  inhibition of DNA synthesis 
A)  disruption of mitotic spindle formation 
B)  inhibition of regulatory protein phosphorylation 
C)  suppression of cyclin production 
D)  myosin denaturation and inhibition of cleavage furrow formation 
E)  inhibition of DNA synthesis

Question 12

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)  tubulin and dynein 
A)  kinetochores 
B)  Golgi-derived vesicles 
C)  actin and myosin 
D)  centrioles and centromeres 
E)  tubulin and dynein

Question 13

Myosin is a motor protein involved in animal cell cytokinesis. It binds to ATP or ADP, causing the myosin to move with respect to actin. What is the effect of the interaction between myosin and actin?

Accepted Answer

A)  Vesicles containing plasma membrane constituents are transported to the metaphase plate, where cytokinesis takes place. 
B)  Excess cytoplasm is removed. 
C)  The cleavage furrow deepens. 
D)  Two new daughter nuclei form. 
A)  Vesicles containing plasma membrane constituents are transported to the metaphase plate, where cytokinesis takes place. 
B)  Excess cytoplasm is removed. 
C)  The cleavage furrow deepens. 
D)  Two new daughter nuclei form.

Question 14

In human and many other eukaryotic species' cells, the nuclear membrane has to disappear to permit ________.

Accepted Answer

A)  cytokinesis 
B)  the attachment of microtubules to kinetochores 
C)  the splitting of the centrosomes 
D)  the disassembly of the nucleolus 
A)  cytokinesis 
B)  the attachment of microtubules to kinetochores 
C)  the splitting of the centrosomes 
D)  the disassembly of the nucleolus

Question 15

The following question(s) are based on the accompanying figure.  
-In the 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 16

The following question(s) are based on the accompanying figure.  
-In the figure, G1 is represented by which numbered part(s) 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 17

At which phase are centrioles beginning to move apart in animal cells?

Accepted Answer

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

Question 18

What happens if MPF (mitosis-promoting factor) is introduced into immature frog oocytes that are arrested in G2?

Accepted Answer

A)  Nothing happens. 
B)  The cells undergo meiosis. 
C)  The cells enter mitosis. 
D)  Cell differentiation is triggered. 
A)  Nothing happens. 
B)  The cells undergo meiosis. 
C)  The cells enter mitosis. 
D)  Cell differentiation is triggered.

Question 19

Use the data in the accompanying table to answer the following question(s).
-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)  beta are in the G0 phase 
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)  beta are in the G0 phase 
E)  beta is a plant cell and gamma is an animal cell

Exam 12: The Cell Cycle

Use the data in the accompanying table to answer the following question(s). -The best conclusion concerning delta is that the cells ________.

Which cytoskeletal proteins are important constituents of the contractile structures that form the cleavage furrows involved in animal cell cytokinesis?

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 ________.

Kinetochore microtubules assist in the process of splitting centromeres by ________.

-In the accompanying figure, MPF reaches its highest concentration during this stage.

Movement of the chromosomes during anaphase would be most affected by a drug that prevents ________.

Which of the following does NOT occur during mitosis?

If there are 20 chromatids in a cell, how many centromeres are there?

Scientists isolate cells in various phases of the cell cycle. They find a group of cells that have times more DNA than G1 phase cells. The cells of this group are ________.

Vinblastine is a standard chemotherapeutic drug used to treat cancer. Because it interferes with the assembly of microtubules, its effectiveness must be related to ________.

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

Myosin is a motor protein involved in animal cell cytokinesis. It binds to ATP or ADP, causing the myosin to move with respect to actin. What is the effect of the interaction between myosin and actin?

In human and many other eukaryotic species' cells, the nuclear membrane has to disappear to permit ________.

The following question(s) are based on the accompanying figure. -In the figure, at which of the numbered regions would you expect to find cells at metaphase?

The following question(s) are based on the accompanying figure. -In the figure, G1 is represented by which numbered part(s) of the cycle?

At which phase are centrioles beginning to move apart in animal cells?

What happens if MPF (mitosis-promoting factor) is introduced into immature frog oocytes that are arrested in G2?

Use the data in the accompanying table to answer the following question(s). -Of the following, the best conclusion concerning the difference between the S phases for beta and gamma is that ________.

Biology and the Tree of Life

Water and Carbon: the Chemical Basis of Life

Protein Structure and Function

Nucleic Acids and the Rna World

An Introduction to Carbohydrates

Ecosystems and Global Ecology

Lipids, Membranes, and the First Cells

Inside the Cell

Energy and Enzymes: an Introduction to Metabolism

Cellular Respiration and Fermentation

Photosynthesis

Cellcell Interactions

Meiosis

Mendel and the Gene

Dna and the Gene: Synthesis and Repair

How Genes Work

Transcription, Rna Processing, and Translation

Control of Gene Expression in Bacteria

Control of Gene Expression in Eukaryotes

The Molecular Revolution: Biotechnology and Beyond

Genes, Development, and Evolution

Evolution by Natural Selection

Evolutionary Processes

Speciation

Phylogenies and the History of Life

Bacteria and Archaea

Protists

Green Algae and Land Plants

Fungi

An Introduction to Animals

Protostome Animals

Deuterostome Animals

Viruses

Plant Form and Function

Water and Sugar Transport in Plants

Plant Nutrition

Plant Sensory Systems, Signals, and Responses

Plant Reproduction and Development

Animal Form and Function

Water and Electrolyte Balance in Animals

Animal Nutrition

Gas Exchange and Circulation

Animal Nervous Systems

Animal Sensory Systems

Animal Movement

Chemical Signals in Animals

Animal Reproduction and Development

The Immune System in Animals

An Introduction to Ecology

Behavioral Ecology

Population Ecology

Community Ecology

Biodiversity and Conservation Biology

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