Question 1

Which molecules play a role in apoptosis?

Accepted Answer

A)  Cohesins 
B)  Caspases 
C)  Centromeres 
D)  Cyclins 
E)  Collagens 
A)  Cohesins 
B)  Caspases 
C)  Centromeres 
D)  Cyclins 
E)  Collagens

Question 2

Which statement about the relationship between cyclin and Cdk's is true?

Accepted Answer

A)  Cdk's activate cyclins. 
B)  Cdk's repress cyclins. 
C)  Cyclins activate Cdk's. 
D)  Cyclins repress Cdk's. 
E)  Cyclins and Cdk's do not interact. 
A)  Cdk's activate cyclins. 
B)  Cdk's repress cyclins. 
C)  Cyclins activate Cdk's. 
D)  Cyclins repress Cdk's. 
E)  Cyclins and Cdk's do not interact.

Question 3

Which event is not required for cell division?

Accepted Answer

A)  Segregation of DNA 
B)  Cytokinesis 
C)  Crossing over 
D)  DNA replication 
E)  All of the above are required for cell division. 
A)  Segregation of DNA 
B)  Cytokinesis 
C)  Crossing over 
D)  DNA replication 
E)  All of the above are required for cell division.

Question 4

Condensed chromatin consists of

Accepted Answer

A)  DNA and histones. 
B)  DNA, histones, and many other proteins. 
C)  RNA and DNA. 
D)  RNA, DNA, and nonhistone proteins. 
E)  DNA only. 
A)  DNA and histones. 
B)  DNA, histones, and many other proteins. 
C)  RNA and DNA. 
D)  RNA, DNA, and nonhistone proteins. 
E)  DNA only.

Question 5

Refer to the figure showing nuclei of somatic cells of a diploid organism with varying chromosomal makeup.   Image _______ best represents a zygote of a diploid organism produced by fertilization.

Accepted Answer

The answer of Refer to the figure showing nuclei of...

Question 6

Refer to the figure showing cyclin-dependent kinases regulating the progress of the cell cycle.   Where would nondividing cells be located?

Accepted Answer

Early in G1 phase, b

Question 7

An excess of one type of chromosome in a cell is an example of

Accepted Answer

A)  allopolyploidy. 
B)  autopolyploidy. 
C)  nondisjunction. 
D)  crossing over. 
E)  aneuploidy. 
A)  allopolyploidy. 
B)  autopolyploidy. 
C)  nondisjunction. 
D)  crossing over. 
E)  aneuploidy.

Question 8

An environmental change that leads to the production of less than the expected amount of cyclin would tend to _______ the activity of the Cdk.This would lead to _______ phosphorylation of the target protein, which in turn would lead to _______ cells being stopped at the checkpoint.

Accepted Answer

A)  increase; increased; more 
B)  increase; decreased; fewer 
C)  increase: increased; fewer 
D)  decrease; increased; fewer 
E)  decrease; decreased; more 
A)  increase; increased; more 
B)  increase; decreased; fewer 
C)  increase: increased; fewer 
D)  decrease; increased; fewer 
E)  decrease; decreased; more

Question 9

Refer to the figure showing nuclei of somatic cells of a diploid organism with varying chromosomal makeup.   Which image best represents the chromosomal makeup of the nucleus of a parent cell immediately prior to mitotic prophase? Explain your answer.

Accepted Answer

Image C. The chromosomes are r

Question 10

Describe how 2 m of DNA in a typical human cell can fit into the nucleus, which is 5 µm in diameter.

Accepted Answer

The DNA is very tightly condensed becaus

Question 11

Which type of microtubule forms the spindle?

Accepted Answer

A)  Kinetochore 
B)  Metaphase 
C)  Mitotic 
D)  Polar 
E)  Prophase 
A)  Kinetochore 
B)  Metaphase 
C)  Mitotic 
D)  Polar 
E)  Prophase

Question 12

A zygote usually has _______ copies of each chromosome.

Accepted Answer

The answer of A zygote usually has _______ copies of...

Question 13

Refer to the figure showing nuclei of somatic cells of a diploid organism with varying chromosomal makeup.   Which image best represents the chromosomal makeup of the nucleus of a daughter cell after successful mitosis and cytokinesis? Explain your answer.

Accepted Answer

Image B. The nucleus

Question 14

The major drawback of asexual reproduction, as compared with sexual reproduction, is that it

Accepted Answer

A)  takes a great deal of time. 
B)  generates variation. 
C)  requires cytokinesis. 
D)  produces less variation among offspring. 
E)  None of the above; there are no major drawbacks associated with asexual reproduction. 
A)  takes a great deal of time. 
B)  generates variation. 
C)  requires cytokinesis. 
D)  produces less variation among offspring. 
E)  None of the above; there are no major drawbacks associated with asexual reproduction.

Question 15

While trying to generate a new variety of an agricultural crop, you are tasked with ensuring that the plants are sterile, so that new seeds must be purchased every year.You realize that polyploidy can be exploited in this case, so you make sure you develop a variety that is _______ so that it cannot undergo normal meiosis to produce viable gametes.

Accepted Answer

The answer of While trying to generate a new variety...

Question 16

A mutation frequently causes a chromosome of a cell line to become detached from the spindle.The most likely consequence of this mutation is that _______ cells will be stopped at the _______ checkpoint.

Accepted Answer

A)  more; G1 
B)  more; G2 
C)  fewer; G1 
D)  more; M 
E)  fewer; M 
A)  more; G1 
B)  more; G2 
C)  fewer; G1 
D)  more; M 
E)  fewer; M

Question 17

Refer to the figure showing the artificial selection of wheat.   If the haploid number is 7, how many chromosomes are in the gametes of the most modern form of wheat?

Accepted Answer

A)  7 
B)  14 
C)  21 
D)  28 
E)  35 
A)  7 
B)  14 
C)  21 
D)  28 
E)  35

Question 18

Accidents that can occur during meiosis and result in trisomies and monosomies are called

Accepted Answer

A)  nondisjunctions. 
B)  inversions. 
C)  reciprocal translocations. 
D)  recombinations. 
E)  induced mutations. 
A)  nondisjunctions. 
B)  inversions. 
C)  reciprocal translocations. 
D)  recombinations. 
E)  induced mutations.

Question 19

Replacing lysine in a histone with a neutral amino acid would make the histone _______ positively charged and _______ likely to bind to DNA.

Accepted Answer

A)  more; more 
B)  more; less 
C)  less; more 
D)  less; less 
E)  None of the above; this replacement would have no effect because lysine is a neutral amino acid. 
A)  more; more 
B)  more; less 
C)  less; more 
D)  less; less 
E)  None of the above; this replacement would have no effect because lysine is a neutral amino acid.

Question 20

An environmental change can lead to the production of more than the expected amount of cyclin.This would tend to _______ the activity of the Cdk, which would lead to _______ phosphorylation of the target protein, which in turn would lead to _______ cells being stopped at the checkpoint.

Accepted Answer

A)  increase; increased; more 
B)  increase; increased; fewer 
C)  increase; decreased; fewer 
D)  decrease; decreased; more 
E)  decrease; decreased; fewer 
A)  increase; increased; more 
B)  increase; increased; fewer 
C)  increase; decreased; fewer 
D)  decrease; decreased; more 
E)  decrease; decreased; fewer

Exam 11: The Cell Cycle and Cell Division

Which molecules play a role in apoptosis?

Which statement about the relationship between cyclin and Cdk's is true?

Which event is not required for cell division?

Condensed chromatin consists of

Refer to the figure showing nuclei of somatic cells of a diploid organism with varying chromosomal makeup. Image _______ best represents a zygote of a diploid organism produced by fertilization.

Refer to the figure showing cyclin-dependent kinases regulating the progress of the cell cycle. Where would nondividing cells be located?

An excess of one type of chromosome in a cell is an example of

An environmental change that leads to the production of less than the expected amount of cyclin would tend to _______ the activity of the Cdk.This would lead to _______ phosphorylation of the target protein, which in turn would lead to _______ cells being stopped at the checkpoint.

Refer to the figure showing nuclei of somatic cells of a diploid organism with varying chromosomal makeup. Which image best represents the chromosomal makeup of the nucleus of a parent cell immediately prior to mitotic prophase? Explain your answer.

Describe how 2 m of DNA in a typical human cell can fit into the nucleus, which is 5 µm in diameter.

Which type of microtubule forms the spindle?

A zygote usually has _______ copies of each chromosome.

Refer to the figure showing nuclei of somatic cells of a diploid organism with varying chromosomal makeup. Which image best represents the chromosomal makeup of the nucleus of a daughter cell after successful mitosis and cytokinesis? Explain your answer.

The major drawback of asexual reproduction, as compared with sexual reproduction, is that it

A mutation frequently causes a chromosome of a cell line to become detached from the spindle.The most likely consequence of this mutation is that _______ cells will be stopped at the _______ checkpoint.

Refer to the figure showing the artificial selection of wheat. If the haploid number is 7, how many chromosomes are in the gametes of the most modern form of wheat?

Accidents that can occur during meiosis and result in trisomies and monosomies are called

Replacing lysine in a histone with a neutral amino acid would make the histone _______ positively charged and _______ likely to bind to DNA.

An environmental change can lead to the production of more than the expected amount of cyclin.This would tend to _______ the activity of the Cdk, which would lead to _______ phosphorylation of the target protein, which in turn would lead to _______ cells being stopped at the checkpoint.

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

Cell Communication and Multicellularity

Energy, Enzymes, and Metabolism

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

Recombinant Dna and Biotechnology

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

Protostome Animals

Deuterostome Animals

The Plant Body

Transport in Plants

Plant Nutrition

Regulation of Plant Growth

Reproduction in Flowering Plants

Plant Responses to Environmental Challenges

Physiology, Homeostasis, and Temperature Regulation

Animal Hormones

Immunology: Animal Defense Systems

Animal Reproduction

Animal Development

Neurons, Glia, and Nervous Systems

Sensory Systems

The Mammalian Nervous System: Structure and Higher Functions

Musculoskeletal Systems

Gas Exchange

Circulatory Systems

Nutrition, Digestion, and Absorption

Salt and Water Balance and Nitrogen Excretion

Animal Behavior

The Physical Environment and Biogeography of Life

Populations

Species Interactions

Communities

Ecosystems

A Changing Biosphere

Filters

An environmental change that leads to the production of less than the expected amount of cyclin would tend to ___ the activity of the Cdk.This would lead to _ phosphorylation of the target protein, which in turn would lead to _____ cells being stopped at the checkpoint.

A mutation frequently causes a chromosome of a cell line to become detached from the spindle.The most likely consequence of this mutation is that _ cells will be stopped at the _ checkpoint.

Replacing lysine in a histone with a neutral amino acid would make the histone _ positively charged and _ likely to bind to DNA.

An environmental change can lead to the production of more than the expected amount of cyclin.This would tend to ___ the activity of the Cdk, which would lead to _ phosphorylation of the target protein, which in turn would lead to _____ cells being stopped at the checkpoint.