Question 1

The energy to move chromosomes during mitosis is provided by

Accepted Answer

A)  centrioles. 
B)  DNA polymerization. 
C)  migration of the centrosomes. 
D)  formation of the cell plate. 
E)  ATP. 
A)  centrioles. 
B)  DNA polymerization. 
C)  migration of the centrosomes. 
D)  formation of the cell plate. 
E)  ATP.

Question 2

Which of the following is true of benign tumors?

Accepted Answer

A)  The cells do not resemble the cells of the parent tissue. 
B)  The cells of the tumor are often irregular, with nuclei of various sizes and shapes. 
C)  The cells grow more rapidly than the cells surrounding it. 
D)  They often metastasize. 
E)  They are not cancer. 
A)  The cells do not resemble the cells of the parent tissue. 
B)  The cells of the tumor are often irregular, with nuclei of various sizes and shapes. 
C)  The cells grow more rapidly than the cells surrounding it. 
D)  They often metastasize. 
E)  They are not cancer.

Question 3

Which of the following statements about cyclin-dependent kinases (Cdk's) or cyclin is false?

Accepted Answer

A)  Different Cdk's act at different points in the cell cycle. 
B)  A Cdk can catalyze the phosphorylation of retinoblastoma protein. 
C)  Phosphorylated retinoblastoma protein is inactive. 
D)  Cdk's use ATP as a substrate. 
E)  Cyclin is made continuously during the cell cycle. 
A)  Different Cdk's act at different points in the cell cycle. 
B)  A Cdk can catalyze the phosphorylation of retinoblastoma protein. 
C)  Phosphorylated retinoblastoma protein is inactive. 
D)  Cdk's use ATP as a substrate. 
E)  Cyclin is made continuously during the cell cycle.

Question 4

Knowledge of the cell cycle has led to improved means of treating cancer. The drug 5-fluorouracil blocks the synthesis of thymine. This drugs inhibits the cell cycle at the end of

Accepted Answer

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

Question 5

Centrosomes

Accepted Answer

A)  are constricted regions of phase 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 phase 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 6

The four haploid nuclei found at the end of meiosis differ from one another in their exact genetic composition. Some of this difference is the result of

Accepted Answer

A)  cytokinesis. 
B)  replication of DNA during the S phase. 
C)  separation of sister chromatids at anaphase II. 
D)  spindle formation. 
E)  crossing over during prophase I. 
A)  cytokinesis. 
B)  replication of DNA during the S phase. 
C)  separation of sister chromatids at anaphase II. 
D)  spindle formation. 
E)  crossing over during prophase I.

Question 7

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 8

Which statement about cytokinesis is true?

Accepted Answer

A)  In animals, a cell plate forms. 
B)  In plants, it is initiated by furrowing of the membrane. 
C)  It follows mitosis. 
D)  In plant cells, actin and myosin play an important part. 
E)  It is the division of the nucleus. 
A)  In animals, a cell plate forms. 
B)  In plants, it is initiated by furrowing of the membrane. 
C)  It follows mitosis. 
D)  In plant cells, actin and myosin play an important part. 
E)  It is the division of the nucleus.

Question 9

Apoptosis

Accepted Answer

A)  occurs in all cells. 
B)  involves the formation of the plasma membrane. 
C)  does not occur in an embryo. 
D)  is a series of programmed events resulting in cell death. 
E)  is the same as necrosis. 
A)  occurs in all cells. 
B)  involves the formation of the plasma membrane. 
C)  does not occur in an embryo. 
D)  is a series of programmed events resulting in cell death. 
E)  is the same as necrosis.

Question 10

Which of the following statements about aneuploidy is false?

Accepted Answer

A)  It results from chromosomal nondisjunction. 
B)  It does not occur in humans. 
C)  An individual with an extra chromosome is trisomic. 
D)  Trisomies are common in human zygotes. 
E)  A piece of one chromosome may translocate to another chromosome. 
A)  It results from chromosomal nondisjunction. 
B)  It does not occur in humans. 
C)  An individual with an extra chromosome is trisomic. 
D)  Trisomies are common in human zygotes. 
E)  A piece of one chromosome may translocate to another chromosome.

Question 11

The basic structure of chromatin has sometimes been referred to as beads on a string of DNA. These beads are called

Accepted Answer

A)  chromosomes. 
B)  chromatids. 
C)  supercoils. 
D)  interphases. 
E)  nucleosomes. 
A)  chromosomes. 
B)  chromatids. 
C)  supercoils. 
D)  interphases. 
E)  nucleosomes.

Question 12

Cells that do not divide are usually arrested in

Accepted Answer

A)  S. 
B)  G1. 
C)  G2. 
D)  M. 
E)  prophase. 
A)  S. 
B)  G1. 
C)  G2. 
D)  M. 
E)  prophase.

Question 13

Chloroplasts contain DNA and reproduce by fission, much like bacteria. DNA replication is not synchronized with chloroplast division. Yet, after division, both daughter chloroplasts contain DNA. How?

Accepted Answer

A)  There are a large number of DNA molecules per chloroplast. 
B)  The DNA is organized into nucleosomes. 
C)  There is a mitotic spindle in dividing chloroplasts. 
D)  Chloroplast DNA is circular. 
E)  None of the above 
A)  There are a large number of DNA molecules per chloroplast. 
B)  The DNA is organized into nucleosomes. 
C)  There is a mitotic spindle in dividing chloroplasts. 
D)  Chloroplast DNA is circular. 
E)  None of the above

Question 14

To divide, cells must be stimulated by external chemical signals called _______.

Accepted Answer

The answer of To divide, cells must be stimulated by...

Question 15

Nucleosomes

Accepted Answer

A)  are made of chromosomes. 
B)  consist entirely of DNA. 
C)  consist of DNA wound around a histone core. 
D)  are present only during mitosis. 
E)  are present only during prophase. 
A)  are made of chromosomes. 
B)  consist entirely of DNA. 
C)  consist of DNA wound around a histone core. 
D)  are present only during mitosis. 
E)  are present only during prophase.

Question 16

The milestone event that defines entry into prometaphase is loss of the _______.

Accepted Answer

The answer of The milestone event that defines entry into...

Question 17

For a prokaryote cell to divide, which of the following must occur?

Accepted Answer

A)  A reproductive signal, replication, segregation of DNA, and cytokinesis 
B)  DNA replication, crossing over, and segregation of DNA 
C)  DNA replication and segregation of DNA 
D)  Cell growth and cytokinesis 
E)  DNA replication, segregation of DNA, and cytokinesis 
A)  A reproductive signal, replication, segregation of DNA, and cytokinesis 
B)  DNA replication, crossing over, and segregation of DNA 
C)  DNA replication and segregation of DNA 
D)  Cell growth and cytokinesis 
E)  DNA replication, segregation of DNA, and cytokinesis

Question 18

Chromatin consists of

Accepted Answer

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

Question 19

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 20

The diagnosis of Down syndrome is made by examining the individual's

Accepted Answer

A)  spores. 
B)  karyotype. 
C)  chromatin. 
D)  nucleosomes. 
E)  kinetochores. 
A)  spores. 
B)  karyotype. 
C)  chromatin. 
D)  nucleosomes. 
E)  kinetochores.

Exam 11: The Cell Cycle and Cell Division

The energy to move chromosomes during mitosis is provided by

Which of the following is true of benign tumors?

Which of the following statements about cyclin-dependent kinases (Cdk's) or cyclin is false?

Knowledge of the cell cycle has led to improved means of treating cancer. The drug 5-fluorouracil blocks the synthesis of thymine. This drugs inhibits the cell cycle at the end of

Centrosomes

The four haploid nuclei found at the end of meiosis differ from one another in their exact genetic composition. Some of this difference is the result of

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

Which statement about cytokinesis is true?

Apoptosis

Which of the following statements about aneuploidy is false?

The basic structure of chromatin has sometimes been referred to as beads on a string of DNA. These beads are called

Cells that do not divide are usually arrested in

Chloroplasts contain DNA and reproduce by fission, much like bacteria. DNA replication is not synchronized with chloroplast division. Yet, after division, both daughter chloroplasts contain DNA. How?

To divide, cells must be stimulated by external chemical signals called _______.

Nucleosomes

The milestone event that defines entry into prometaphase is loss of the _______.

For a prokaryote cell to divide, which of the following must occur?

Chromatin consists of

Genetic recombination occurs during

The diagnosis of Down syndrome is made by examining the individual's

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