Question 1

Measurements of the amount of DNA per nucleus were taken on a large number of cells from a growing fungus. The measured DNA levels ranged from 3 to 6 picograms per nucleus. In which stage of the cell cycle did the nucleus contain 6 picograms of DNA?

Accepted Answer

A)   G₁
B)   S
C)   G₂
D)   G₀E) A) and B)
F) None of the above

Question 2

Certain cell types normally have several nuclei per cell. How could such multinucleated cells be explained?

Accepted Answer

A)   The cell underwent repeated cytokinesis but no mitosis.
B)   The cell underwent repeated mitosis with simultaneous cytokinesis.
C)   The cell underwent repeated mitosis, but cytokinesis did not occur.
D)   The cell had multiple S phases before it entered mitosis.E) B) and D)
F) B) and C)

Question 3

Use the figure to answer the question below.

If the cell whose nuclear material is shown in the figure continues toward completion of mitosis, which of the following events would occur next?

Accepted Answer

A)   spindle fiber formation
B)   nuclear envelope breakdown
C)   formation of telophase nuclei
D)   synthesis of chromatidsE) A) and B)
F) A) and C)

Question 4

In a diploid cell with 5 chromosome pairs (2n = 10) , how many sister chromatids will be found in a nucleus at prophase of mitosis?

Accepted Answer

A)   5
B)   10
C)   20
D)   40E) C) and D)
F) None of the above

Question 5

At which phase of the cell cycle do centrioles begin to move apart in animal cells?

Accepted Answer

A)   anaphase
B)   telophase
C)   metaphase
D)   prophaseE) A) and C)
F) A) and D)

Question 6

Taxol is an anticancer drug extracted from the Pacific yew tree. In animal cells, Taxol prevents microtubule depolymerization. Thus, Taxol stops mitosis by interfering with which of the following structures or processes?

Accepted Answer

A)   the mitotic spindle
B)   cytokinesis
C)   centriole duplication
D)   chromosome condensationE) A) and C)
F) A) and B)

Question 7

Which of the following molecules is a protein synthesized at specific times during the cell cycle that associates with a kinase to form a catalytically active complex?

Accepted Answer

A)   PDGF
B)   MPF
C)   cyclin
D)   CdkE) A) and B)
F) A) and C)

Question 8

Use the figure to answer the question below.

In the figure, at which of the numbered regions would you expect to find cells at metaphase?

Accepted Answer

A)  II and IV
B)  II only
C)  III only
D)  IV onlyE) A) and B)
F) A) and C)

Question 9

G₁ is associated with which of the following cellular events?

Accepted Answer

A)   normal growth and cell function
B)   DNA replication
C)   the beginning of mitosis
D)   break down of the nuclear membraneE) B) and D)
F) A) and B)

Question 10

What would you expect to happen if MPF (maturation-promoting factor) is introduced into immature frog oocytes that are arrested in G₂?

Accepted Answer

A)   The cells would remain arrested in G₂.
B)   The cells would enter G₀.
C)   The cells would enter mitosis.
D)   The cells would begin DNA synthesis.E) A) and D)
F) All of the above

Question 11

In the cells of some organisms, mitosis occurs without cytokinesis. This will result in

Accepted Answer

A)   cells with more than one nucleus.
B)   cells that are unusually small.
C)   cells lacking nuclei.
D)   cell cycles lacking an S phase.E) None of the above
F) C) and D)

Question 12

Early observations of a cultured cell line indicated that the cells did not exhibit either density-dependent inhibition or anchorage dependence. What do these observations suggest about this cell line?

Accepted Answer

A)   The cells are unable to form spindle microtubules.
B)   The cells follow an altered series of cell cycle phases.
C)   The cells show characteristics of tumors.
D)   The cells have nonfunctional MPF.E) B) and C)
F) A) and D) C

Question 13

The M phase checkpoint ensures that all chromosomes are attached to the mitotic spindle. If this does not happen, cells would most likely be arrested in ________.

Accepted Answer

A)   telophase
B)   prophase
C)   G₂
D)   metaphaseE) None of the above
F) A) and B) D

Question 14

The beginning of anaphase is indicated by which of the following processes?

Accepted Answer

A)   Loss of kinetochores from the chromatids.
B)   Attachment of sister chromatids to each other by cohesin.
C)   Enzymatic cleavage of cohesin.
D)   Disappearance of the nuclear membrane.E) A) and B)
F) C) and D)

Question 15

During which phase of mitosis do the chromatids become chromosomes?

Accepted Answer

A)   telophase
B)   anaphase
C)   prophase
D)   metaphaseE) A) and D)
F) B) and D)

Question 16

In a diploid cell with 5 chromosome pairs (2n = 10) , how many centromeres will be found in a nucleus at G2 of the cell division cycle?

Accepted Answer

A)   5
B)   10
C)   20
D)   40E) A) and C)
F) B) and D)

Question 17

Use the figure to answer the question below.
The unlettered circle at the top of the figure shows a diploid nucleus with four chromosomes that have not yet replicated. There are two pairs of homologous chromosomes, one long and the other short. One haploid set is black, and the other is gray. The circles labeled A to E show various combinations of these chromosomes.

What is the correct chromosomal condition at prometaphase of mitosis?

Accepted Answer

A)   B
B)   C
C)   D
D)   EE) All of the above
F) A) and B) A

Question 18

Scientists isolate cells in various phases of the cell cycle. They isolate a group of cells that have 1 1/2 times more DNA than G₁ phase cells. What is the most likely part of the cell cycle from which these cells were isolated?

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 cycleE) A) and C)
F) A) and B)

Question 19

Which of the following events occurs during interphase of the cell cycle?

Accepted Answer

A)   condensation of the chromosomes
B)   separation of the spindle poles
C)   spindle formation
D)   replication of the DNAE) A) and B)
F) A) and C)

Question 20

The mitotic spindle plays a critical role in which of the following processes?

Accepted Answer

A)   splitting of the cell (cytokinesis)  following mitosis
B)   triggering the compaction and condensation of chromosomes
C)   dissolving the nuclear membrane
D)   separation of sister chromatidsE) B) and D)
F) A) and C)

Exam 12: The Cell Cycle

Measurements of the amount of DNA per nucleus were taken on a large number of cells from a growing fungus. The measured DNA levels ranged from 3 to 6 picograms per nucleus. In which stage of the cell cycle did the nucleus contain 6 picograms of DNA?

Correct Answer
verified

Certain cell types normally have several nuclei per cell. How could such multinucleated cells be explained?

Correct Answer
verified

Use the figure to answer the question below. If the cell whose nuclear material is shown in the figure continues toward completion of mitosis, which of the following events would occur next?

Correct Answer
verified

In a diploid cell with 5 chromosome pairs (2n = 10) , how many sister chromatids will be found in a nucleus at prophase of mitosis?

Correct Answer
verified

At which phase of the cell cycle do centrioles begin to move apart in animal cells?

Correct Answer
verified

Taxol is an anticancer drug extracted from the Pacific yew tree. In animal cells, Taxol prevents microtubule depolymerization. Thus, Taxol stops mitosis by interfering with which of the following structures or processes?

Correct Answer
verified

Which of the following molecules is a protein synthesized at specific times during the cell cycle that associates with a kinase to form a catalytically active complex?

Correct Answer
verified

Use the figure to answer the question below. In the figure, at which of the numbered regions would you expect to find cells at metaphase?

Correct Answer
verified

G₁ is associated with which of the following cellular events?

Correct Answer
verified

What would you expect to happen if MPF (maturation-promoting factor) is introduced into immature frog oocytes that are arrested in G₂?

Correct Answer
verified

In the cells of some organisms, mitosis occurs without cytokinesis. This will result in

Correct Answer
verified

Early observations of a cultured cell line indicated that the cells did not exhibit either density-dependent inhibition or anchorage dependence. What do these observations suggest about this cell line?

Correct Answer
verified
C

The M phase checkpoint ensures that all chromosomes are attached to the mitotic spindle. If this does not happen, cells would most likely be arrested in ________.

Correct Answer
verified
D

The beginning of anaphase is indicated by which of the following processes?

Correct Answer
verified

During which phase of mitosis do the chromatids become chromosomes?

Correct Answer
verified

In a diploid cell with 5 chromosome pairs (2n = 10) , how many centromeres will be found in a nucleus at G2 of the cell division cycle?

Correct Answer
verified

Correct Answer
verified
A

Scientists isolate cells in various phases of the cell cycle. They isolate a group of cells that have 1 1/2 times more DNA than G₁ phase cells. What is the most likely part of the cell cycle from which these cells were isolated?

Correct Answer
verified

Which of the following events occurs during interphase of the cell cycle?

Correct Answer
verified

The mitotic spindle plays a critical role in which of the following processes?

Correct Answer
verified

Exam 12: The Cell Cycle

Measurements of the amount of DNA per nucleus were taken on a large number of cells from a growing fungus. The measured DNA levels ranged from 3 to 6 picograms per nucleus. In which stage of the cell cycle did the nucleus contain 6 picograms of DNA?

Correct AnswerverifiedShow Answer

Certain cell types normally have several nuclei per cell. How could such multinucleated cells be explained?

Correct AnswerverifiedShow Answer

Use the figure to answer the question below. If the cell whose nuclear material is shown in the figure continues toward completion of mitosis, which of the following events would occur next?

Correct AnswerverifiedShow Answer

In a diploid cell with 5 chromosome pairs (2n = 10) , how many sister chromatids will be found in a nucleus at prophase of mitosis?

Correct AnswerverifiedShow Answer

At which phase of the cell cycle do centrioles begin to move apart in animal cells?

Correct AnswerverifiedShow Answer

Taxol is an anticancer drug extracted from the Pacific yew tree. In animal cells, Taxol prevents microtubule depolymerization. Thus, Taxol stops mitosis by interfering with which of the following structures or processes?

Correct AnswerverifiedShow Answer

Which of the following molecules is a protein synthesized at specific times during the cell cycle that associates with a kinase to form a catalytically active complex?

Correct AnswerverifiedShow Answer

Use the figure to answer the question below. In the figure, at which of the numbered regions would you expect to find cells at metaphase?

Correct AnswerverifiedShow Answer

G₁ is associated with which of the following cellular events?

Correct AnswerverifiedShow Answer

What would you expect to happen if MPF (maturation-promoting factor) is introduced into immature frog oocytes that are arrested in G₂?

Correct AnswerverifiedShow Answer

In the cells of some organisms, mitosis occurs without cytokinesis. This will result in

Correct AnswerverifiedShow Answer

Early observations of a cultured cell line indicated that the cells did not exhibit either density-dependent inhibition or anchorage dependence. What do these observations suggest about this cell line?

Correct AnswerverifiedC

The M phase checkpoint ensures that all chromosomes are attached to the mitotic spindle. If this does not happen, cells would most likely be arrested in ________.

Correct AnswerverifiedD

The beginning of anaphase is indicated by which of the following processes?

Correct AnswerverifiedShow Answer

During which phase of mitosis do the chromatids become chromosomes?

Correct AnswerverifiedShow Answer

In a diploid cell with 5 chromosome pairs (2n = 10) , how many centromeres will be found in a nucleus at G2 of the cell division cycle?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedA

Scientists isolate cells in various phases of the cell cycle. They isolate a group of cells that have 1 1/2 times more DNA than G₁ phase cells. What is the most likely part of the cell cycle from which these cells were isolated?

Correct AnswerverifiedShow Answer

Which of the following events occurs during interphase of the cell cycle?

Correct AnswerverifiedShow Answer

The mitotic spindle plays a critical role in which of the following processes?

Correct AnswerverifiedShow Answer

Correct Answer
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C

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D

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A

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