Question 1

When does a cell make the commitment for another cell cycle?

Accepted Answer

A)  Early in G1 
B)  Late in G2 
C)  At the transition between G1 and G2 
D)  At the transition between S and G2 
E)  At the transition between G1 and S 
A)  Early in G1 
B)  Late in G2 
C)  At the transition between G1 and G2 
D)  At the transition between S and G2 
E)  At the transition between G1 and S

Question 2

Refer to the figure showing a cell during mitosis.   The phase this cell is in is most likely _______.

Accepted Answer

The answer of Refer to the figure showing a cell...

Question 3

What is the essential difference between necrosis and apoptosis?

Accepted Answer

A)  In apoptosis, the cell death is part of the normal developmental process; in necrosis, by contrast, the cell death is the result of something gone wrong. 
B)  Necrosis occurs in animals, while apoptosis occurs in plants. 
C)  In necrosis, the cells actually die. In apoptosis, they are just dormant. 
D)  In apoptosis, the cells actually die. In necrosis, they are just dormant. 
E)  There is no difference; they are different words to describe the same phenomenon. 
A)  In apoptosis, the cell death is part of the normal developmental process; in necrosis, by contrast, the cell death is the result of something gone wrong. 
B)  Necrosis occurs in animals, while apoptosis occurs in plants. 
C)  In necrosis, the cells actually die. In apoptosis, they are just dormant. 
D)  In apoptosis, the cells actually die. In necrosis, they are just dormant. 
E)  There is no difference; they are different words to describe the same phenomenon.

Question 4

If a cell in G1 has 1.2 pg of DNA, it will have _______ pg of DNA in G2.

Accepted Answer

The answer of If a cell in G1 has 1.2...

Question 5

A bacterial colony grows steadily by rapid cell division in a medium that is rich in the amino acid alanine.If the alanine concentration drops, cell division slows.Supplying more alanine results in resumed cell division.Alanine is thus

Accepted Answer

A)  a fertilization signal. 
B)  a ter site. 
C)  a reproductive signal. 
D)  an oncogene. 
E)  an ori site. 
A)  a fertilization signal. 
B)  a ter site. 
C)  a reproductive signal. 
D)  an oncogene. 
E)  an ori site.

Question 6

The event in the cell division process that clearly involves microfilaments is

Accepted Answer

A)  chromosome separation during anaphase. 
B)  movement of chromosomes to the metaphase plate. 
C)  chromosome condensation during prophase. 
D)  disappearance of the nuclear envelope during prophase. 
E)  cytokinesis in animal cells. 
A)  chromosome separation during anaphase. 
B)  movement of chromosomes to the metaphase plate. 
C)  chromosome condensation during prophase. 
D)  disappearance of the nuclear envelope during prophase. 
E)  cytokinesis in animal cells.

Question 7

Necrosis

Accepted Answer

A)  is the same as apoptosis. 
B)  is a form of cell death that can occur due to an environmental insult. 
C)  involves the production of caspases. 
D)  is a form of polyploidy. 
E)  is a type of cell division. 
A)  is the same as apoptosis. 
B)  is a form of cell death that can occur due to an environmental insult. 
C)  involves the production of caspases. 
D)  is a form of polyploidy. 
E)  is a type of cell division.

Question 8

Genetic recombination occurs during

Accepted Answer

A)  prophase of meiosis I. 
B)  the interphase preceding meiosis II. 
C)  the mitotic telophase. 
D)  fertilization. 
E)  the formation of somatic cells. 
A)  prophase of meiosis I. 
B)  the interphase preceding meiosis II. 
C)  the mitotic telophase. 
D)  fertilization. 
E)  the formation of somatic cells.

Question 9

If you were interested in determining the rates of recombination in an organism, what feature of meiosis would you observe?

Accepted Answer

A)  Synapsis 
B)  Aneuploidy 
C)  Nondisjunction 
D)  Chiasmata 
E)  Chromatin 
A)  Synapsis 
B)  Aneuploidy 
C)  Nondisjunction 
D)  Chiasmata 
E)  Chromatin

Question 10

Chromosome number is reduced during meiosis because the process consists of

Accepted Answer

A)  two cell divisions without any chromosome replication. 
B)  a single cell division without any chromosome replication. 
C)  two cell divisions in which half of the chromosomes are destroyed. 
D)  two cell divisions and only a single round of chromosome replication. 
E)  None of the above; chromosome number is not reduced during meiosis. 
A)  two cell divisions without any chromosome replication. 
B)  a single cell division without any chromosome replication. 
C)  two cell divisions in which half of the chromosomes are destroyed. 
D)  two cell divisions and only a single round of chromosome replication. 
E)  None of the above; chromosome number is not reduced during meiosis.

Question 11

Which situation would be the most likely result of a mutation in a eukaryotic organism that causes it to produce less p21 protein than normal?

Accepted Answer

A)  Cell replication would be slowed if the organism receives radiation. 
B)  Cells with radiation-induced DNA damage would continue through the cell cycle without repairing the damaged DNA. 
C)  Cells with incomplete DNA replication would continue through the checkpoint. 
D)  Cells would not respond to growth factors. 
E)  Cells would have a hypersensitive response to growth factors. 
A)  Cell replication would be slowed if the organism receives radiation. 
B)  Cells with radiation-induced DNA damage would continue through the cell cycle without repairing the damaged DNA. 
C)  Cells with incomplete DNA replication would continue through the checkpoint. 
D)  Cells would not respond to growth factors. 
E)  Cells would have a hypersensitive response to growth factors.

Question 12

The activity of oncogenes

Accepted Answer

A)  increases the rate of growth of cancer cells. 
B)  retards the growth of cancer cells. 
C)  is derived from normal regulators of cell division. 
D)  can include inhibition of the cell cycle. 
E)  Both a and c 
A)  increases the rate of growth of cancer cells. 
B)  retards the growth of cancer cells. 
C)  is derived from normal regulators of cell division. 
D)  can include inhibition of the cell cycle. 
E)  Both a and c

Question 13

Refer to the figure showing crossing over.   This figure depicts

Accepted Answer

A)  prophase I. 
B)  prophase II. 
C)  metaphase I. 
D)  metaphase II. 
E)  anaphase. 
A)  prophase I. 
B)  prophase II. 
C)  metaphase I. 
D)  metaphase II. 
E)  anaphase.

Question 14

Centrosomes

Accepted Answer

A)  are constricted regions of prophase chromosomes. 
B)  determine the plane of cell division. 
C)  are the central region of the cell. 
D)  are the region where the membrane constricts during cytokinesis. 
E)  are part of cilia. 
A)  are constricted regions of prophase chromosomes. 
B)  determine the plane of cell division. 
C)  are the central region of the cell. 
D)  are the region where the membrane constricts during cytokinesis. 
E)  are part of cilia.

Question 15

How does a nucleus in G2 differ from a nucleus in G1?

Accepted Answer

A)  The G2 nucleus has double the amount of DNA as the G1 nucleus. 
B)  DNA synthesis occurs only in G1 phase. 
C)  Inactive cells are arrested only in G2 phase. 
D)  During G2 the cell prepares for S phase. 
E)  None of the above; there is no difference in the nucleus between G1 and G2. 
A)  The G2 nucleus has double the amount of DNA as the G1 nucleus. 
B)  DNA synthesis occurs only in G1 phase. 
C)  Inactive cells are arrested only in G2 phase. 
D)  During G2 the cell prepares for S phase. 
E)  None of the above; there is no difference in the nucleus between G1 and G2.

Question 16

Which phenomenon will most likely lead to aneuploidy?

Accepted Answer

A)  Crossing over 
B)  Independent assortment 
C)  Nondisjunction 
D)  Autopolyploidy 
E)  Allopolyploidy 
A)  Crossing over 
B)  Independent assortment 
C)  Nondisjunction 
D)  Autopolyploidy 
E)  Allopolyploidy

Question 17

In an organism with a haplontic life cycle, the adult multicellular organism is _______, and the time spent between fertilization and meiosis is _______ the time spent between meiosis and fertilization.

Accepted Answer

A)  haploid; longer than 
B)  haploid; shorter than 
C)  diploid; longer than 
D)  diploid; equal to 
E)  diploid; shorter than 
A)  haploid; longer than 
B)  haploid; shorter than 
C)  diploid; longer than 
D)  diploid; equal to 
E)  diploid; shorter than

Question 18

The haploid chromosome number of a cell is 32.How many chromosomes will a trisomic individual have?

Accepted Answer

A)  31 
B)  32 
C)  63 
D)  65 
E)  96 
A)  31 
B)  32 
C)  63 
D)  65 
E)  96

Question 19

Which eukaryotic process has no analogue in prokaryotes?

Accepted Answer

A)  Response to reproductive signals 
B)  DNA replication 
C)  Segregation of DNA to new cells 
D)  Meiosis 
E)  Cytokinesis 
A)  Response to reproductive signals 
B)  DNA replication 
C)  Segregation of DNA to new cells 
D)  Meiosis 
E)  Cytokinesis

Question 20

The DNA of a eukaryotic cell is

Accepted Answer

A)  double-stranded and linear. 
B)  single-stranded and linear. 
C)  double-stranded and circular. 
D)  single-stranded and circular. 
E)  conservative. 
A)  double-stranded and linear. 
B)  single-stranded and linear. 
C)  double-stranded and circular. 
D)  single-stranded and circular. 
E)  conservative.

Exam 11: The Cell Cycle and Cell Division

When does a cell make the commitment for another cell cycle?

Refer to the figure showing a cell during mitosis. The phase this cell is in is most likely _______.

What is the essential difference between necrosis and apoptosis?

If a cell in G1 has 1.2 pg of DNA, it will have _______ pg of DNA in G2.

A bacterial colony grows steadily by rapid cell division in a medium that is rich in the amino acid alanine.If the alanine concentration drops, cell division slows.Supplying more alanine results in resumed cell division.Alanine is thus

The event in the cell division process that clearly involves microfilaments is

Necrosis

Genetic recombination occurs during

If you were interested in determining the rates of recombination in an organism, what feature of meiosis would you observe?

Chromosome number is reduced during meiosis because the process consists of

Which situation would be the most likely result of a mutation in a eukaryotic organism that causes it to produce less p21 protein than normal?

The activity of oncogenes

Refer to the figure showing crossing over. This figure depicts

Centrosomes

How does a nucleus in G2 differ from a nucleus in G1?

Which phenomenon will most likely lead to aneuploidy?

In an organism with a haplontic life cycle, the adult multicellular organism is _______, and the time spent between fertilization and meiosis is _______ the time spent between meiosis and fertilization.

The haploid chromosome number of a cell is 32.How many chromosomes will a trisomic individual have?

Which eukaryotic process has no analogue in prokaryotes?

The DNA of a eukaryotic cell is

Studying Life

Small Molecules and the Chemistry of Life

Proteins, Carbohydrates, and Lipids

Nucleic Acids and the Origin of Life

Cells: the Working Units of Life

Cell Membranes

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Pathways That Harvest Chemical Energy

Photosynthesis: Energy From Sunlight

Inheritance, Genes, and Chromosomes

Dna and Its Role in Heredity

From Dna to Protein: Gene Expression

Gene Mutation and Molecular Medicine

Regulation of Gene Expression

Genomes

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Mechanisms of Evolution

Reconstructing and Using Phylogenies

Speciation

Evolution of Genes and Genomes

The History of Life on Earth

Bacteria, Archaea, and Viruses

The Origin and Diversification of Eukaryotes

Plants Without Seeds: From Water to Land

The Evolution of Seed Plants

The Evolution and Diversity of Fungi

Animal Origins and the Evolution of Body Plans

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In an organism with a haplontic life cycle, the adult multicellular organism is _, and the time spent between fertilization and meiosis is _ the time spent between meiosis and fertilization.