Question 1

What action do Cdk's perform on target proteins?

Accepted Answer

A)  They make allosteric changes by binding to the protein. 
B)  They add a methyl group to the protein. 
C)  They remove a methyl group from the protein. 
D)  They add a phosphate group to the protein. 
E)  They remove a phosphate group from the protein. 
A)  They make allosteric changes by binding to the protein. 
B)  They add a methyl group to the protein. 
C)  They remove a methyl group from the protein. 
D)  They add a phosphate group to the protein. 
E)  They remove a phosphate group from the protein.

Question 2

In plant cells, cytokinesis is accomplished by the formation of a(n)

Accepted Answer

A)  aster. 
B)  membrane furrow. 
C)  equatorial plate. 
D)  cell plate. 
E)  spindle. 
A)  aster. 
B)  membrane furrow. 
C)  equatorial plate. 
D)  cell plate. 
E)  spindle.

Question 3

The stage of the cell cycle during which DNA replicates is called _______.

Accepted Answer

The answer of The stage of the cell cycle during...

Question 4

At the milestone that defines metaphase, the chromosomes

Accepted Answer

A)  separate. 
B)  come together. 
C)  are at opposite poles. 
D)  cross over. 
E)  line up at the equatorial plate. 
A)  separate. 
B)  come together. 
C)  are at opposite poles. 
D)  cross over. 
E)  line up at the equatorial plate.

Question 5

Refer to the figure showing two sexual life cycles.   Which sexual life cycles are represented? Provide an example organism for each life cycle, and describe the mature organism.

Accepted Answer

A is a diplontic life cycle; B is a hapl

Question 6

Refer to the figure showing crossing over.   Which statement about the chromosomes is true?

Accepted Answer

A)  The red chromosomes are both derived from the same parent. 
B)  One of the red chromosomes and one of the blue chromosomes came from the same parent. 
C)  The two red chromosomes are homologous. 
D)  A centromere forms where the crossing over occurs. 
E)  Because these chromosomes are homologous, crossing over will not result in any genetic diversity. 
A)  The red chromosomes are both derived from the same parent. 
B)  One of the red chromosomes and one of the blue chromosomes came from the same parent. 
C)  The two red chromosomes are homologous. 
D)  A centromere forms where the crossing over occurs. 
E)  Because these chromosomes are homologous, crossing over will not result in any genetic diversity.

Question 7

A bacterial cell gives rise to two genetically identical daughter cells by a process known as

Accepted Answer

A)  nondisjunction. 
B)  mitosis. 
C)  meiosis. 
D)  fission. 
E)  fertilization. 
A)  nondisjunction. 
B)  mitosis. 
C)  meiosis. 
D)  fission. 
E)  fertilization.

Question 8

The normal haploid number of a plant species is 28.An individual is found with 55 chromosomes.This individual is most likely

Accepted Answer

A)  a typical diploid. 
B)  monosomic. 
C)  trisomic. 
D)  triploid. 
E)  tetraploid. 
A)  a typical diploid. 
B)  monosomic. 
C)  trisomic. 
D)  triploid. 
E)  tetraploid.

Question 9

An environmental change leads to cyclin being degraded at a rate much faster than normal.Such a change 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; decreased; fewer 
C)  decrease: increased; fewer 
D)  decrease; decreased; more 
E)  decrease; decreased; fewer 
A)  increase; increased; more 
B)  increase; decreased; fewer 
C)  decrease: increased; fewer 
D)  decrease; decreased; more 
E)  decrease; decreased; fewer

Question 10

Replacing arginine 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 arginine 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 arginine is a neutral amino acid.

Question 11

Why is meiosis sometimes called "reductive division"?

Accepted Answer

A)  It has fewer overall steps than mitosis. 
B)  It has fewer prophase steps than mitosis. 
C)  It involves crossing over. 
D)  It results in a reduction of the number of chromosomes. 
E)  It reduces the amount of cytoplasm in the cell. 
A)  It has fewer overall steps than mitosis. 
B)  It has fewer prophase steps than mitosis. 
C)  It involves crossing over. 
D)  It results in a reduction of the number of chromosomes. 
E)  It reduces the amount of cytoplasm in the cell.

Question 12

The replication of the DNA in chromosomes during S phase leads to the formation of _______ in G2.

Accepted Answer

A)  centromeres 
B)  histone sites 
C)  sister chromatids 
D)  daughter chromosomes 
E)  sister chromosomes 
A)  centromeres 
B)  histone sites 
C)  sister chromatids 
D)  daughter chromosomes 
E)  sister chromosomes

Question 13

Enzymes known as _______ hydrolyze target molecules in cells undergoing apoptosis.

Accepted Answer

The answer of Enzymes known as _______ hydrolyze target molecules...

Question 14

If a bacterial colony is grown in a medium that is rich in the amino acid lysine, cell division proceeds rapidly and the colony grows steadily.If the lysine concentration drops, cell division slows; if the lysine concentration is restored, cell division resumes.Lysine is thus a(n)

Accepted Answer

A)  fertilization signal. 
B)  ori site. 
C)  reproductive signal. 
D)  oncogene. 
E)  fission activator. 
A)  fertilization signal. 
B)  ori site. 
C)  reproductive signal. 
D)  oncogene. 
E)  fission activator.

Question 15

What stage in the cell cycle comes immediately before S?

Accepted Answer

A)  M 
B)  G1 
C)  G2 
D)  Prophase 
E)  Anaphase 
A)  M 
B)  G1 
C)  G2 
D)  Prophase 
E)  Anaphase

Question 16

The products of meiosis are

Accepted Answer

A)  clones. 
B)  zygotes. 
C)  chiasmata. 
D)  sister chromatids. 
E)  gametes. 
A)  clones. 
B)  zygotes. 
C)  chiasmata. 
D)  sister chromatids. 
E)  gametes.

Question 17

The diploid number for Norway rats is 42.How many different types of gametes can be produced from meiosis in a diploid organism from independent assortment alone (i.e., no crossing over)?

Accepted Answer

A)  221 
B)  242 
C)  284 
D)  212 
E)  422 
A)  221 
B)  242 
C)  284 
D)  212 
E)  422

Question 18

Refer to the figure showing two sexual life cycles.   An example of an organism with life cycle A is _______, and an example of an organism with life cycle B is _______.

Accepted Answer

A)  a bird; Rhizopus fungus 
B)  Rhizopus fungus; a bird 
C)  a fern; a sheep 
D)  Rhizopus fungus; a fern 
E)  a bird; a sheep 
A)  a bird; Rhizopus fungus 
B)  Rhizopus fungus; a bird 
C)  a fern; a sheep 
D)  Rhizopus fungus; a fern 
E)  a bird; a sheep

Question 19

You measure the DNA content of a few eukaryotic cells that are from a dividing population of cells (i.e., a group of cells from a single organism).Cell 1 has 8 pg of DNA, cell 2 has 12 pg, and cell 3 has 16 pg.You determine which cell is in which stage of the cell cycle: cell 1 is in G1, cell 2 is in _______, and cell 3 is in G2.

Accepted Answer

The answer of You measure the DNA content of a...

Question 20

During prophase I of meiosis, a unique event called _______ results in the formation of recombinant chromosomes.

Accepted Answer

The answer of During prophase I of meiosis, a unique...

Exam 11: The Cell Cycle and Cell Division

What action do Cdk's perform on target proteins?

In plant cells, cytokinesis is accomplished by the formation of a(n)

The stage of the cell cycle during which DNA replicates is called _______.

At the milestone that defines metaphase, the chromosomes

Refer to the figure showing two sexual life cycles. Which sexual life cycles are represented? Provide an example organism for each life cycle, and describe the mature organism.

Refer to the figure showing crossing over. Which statement about the chromosomes is true?

A bacterial cell gives rise to two genetically identical daughter cells by a process known as

The normal haploid number of a plant species is 28.An individual is found with 55 chromosomes.This individual is most likely

An environmental change leads to cyclin being degraded at a rate much faster than normal.Such a change 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.

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

Why is meiosis sometimes called "reductive division"?

The replication of the DNA in chromosomes during S phase leads to the formation of _______ in G2.

Enzymes known as _______ hydrolyze target molecules in cells undergoing apoptosis.

If a bacterial colony is grown in a medium that is rich in the amino acid lysine, cell division proceeds rapidly and the colony grows steadily.If the lysine concentration drops, cell division slows; if the lysine concentration is restored, cell division resumes.Lysine is thus a(n)

What stage in the cell cycle comes immediately before S?

The products of meiosis are

The diploid number for Norway rats is 42.How many different types of gametes can be produced from meiosis in a diploid organism from independent assortment alone (i.e., no crossing over)?

Refer to the figure showing two sexual life cycles. An example of an organism with life cycle A is _______, and an example of an organism with life cycle B is _______.

During prophase I of meiosis, a unique event called _______ results in the formation of recombinant chromosomes.

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 leads to cyclin being degraded at a rate much faster than normal.Such a change 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.

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

Refer to the figure showing two sexual life cycles. An example of an organism with life cycle A is _, and an example of an organism with life cycle B is _.