Question 1

Which of the following organelles would be abundant and in close proximity to the cell plate in a plant cell undergoing cytokinesis?

Accepted Answer

A)   centrioles
B)   Golgi apparatus
C)   rough endoplasmic reticulum
D)   lysosomes
E)   central vacuoleF) A) and C)
G) B) and D)

Question 2

A mutation results in a cell that no longer produces a normal protein kinase for the M-phase checkpoint.Which of the following would likely be the immediate result of this mutation?

Accepted Answer

A)   The cell would prematurely enter anaphase.
B)   The cell would never leave metaphase.
C)   The cell would never enter metaphase.
D)   The cell would never enter prophase.
E)   The cell would undergo normal mitosis, but fail to enter the next G1.F) C) and D)
G) B) and C)

Question 3

A mutation that causes a gain of function in a tumor suppressor gene would not likely cause cancer because a tumor suppressor protein

Accepted Answer

A)   normally promotes the cell cycle.
B)   normally responds to growth factors.
C)   activates a signal transduction pathway.
D)   inactivates growth factors.
E)   does not promote cell division.F) A) and D)
G) A) and E)

Question 4

Proto-oncogenes function by preventing cells from dividing uncontrollably.

Accepted Answer

A) True 
 B)False

Question 5

If there are twenty centromeres in a cell,how many chromosomes are there?

Accepted Answer

A)   10
B)   20
C)   30
D)   40
E)   80F) A) and C)
G) B) and D)

Question 6

Which of the following is not a characteristic of cancer cells?

Accepted Answer

A)   cells that have lost contact inhibition
B)   cells with abnormal nuclei
C)   cells which function normally for tissue they are in
D)   cells that lack differentiation
E)   cells that have uncontrolled cell divisionF) A) and E)
G) A) and D)

Question 7

Proteins that are involved in the regulation of the cell cycle,and that show fluctuation in concentration during the cell cycle,are called

Accepted Answer

A)   centromeres.
B)   kinetochores.
C)   centrioles.
D)   proton pumps.
E)   cyclins.F) D) and E)
G) A) and E)

Question 8

A translocation may lead to cancer if it

Accepted Answer

A)   disrupts control of expression of genes that regulate the cell cycle.
B)   deletes the telomere of the chromosome.
C)   moves genes from one chromosome to another.
D)   activates tumor suppressor genes.
E)   affects both tumor suppressor and proto-oncogenes.F) None of the above
G) A) and E)

Question 9

Cancer is a disorder in which some cells have lost the ability to control their

Accepted Answer

A)   size.
B)   spindle fibers.
C)   growth rate.
D)   surface area.
E)   volume.F) C) and D)
G) B) and C)

Question 10

All of the following statements are true about mitosis except

Accepted Answer

A)   the cells arising from the process are genetically alike.
B)   the process of mitosis is followed by cytokinesis.
C)   spindle fibers are involved in the movement of chromosomes.
D)   both sexually and asexually reproducing organisms utilize the process of mitosis.
E)   the cells arising from the process contain only half of the necessary genetic material.F) B) and C)
G) A) and D)

Question 11

The spindle serves two rolls in mitotic cell division.These are

Accepted Answer

A)   to separate the sister chromatids and to elongate the cell.
B)   to separate the non-sister chromatids and then the homologous chromosomes.
C)   to separate the sister chromatids and then the non-sister chromatids.
D)   to separate the sister chromatids and then form the cleavage furrow.
E)   to separate the homologous chromosomes and then form the cleavage furrow.F) A) and B)
G) C) and D)

Question 12

Cytokinesis in plants occurs as _______________ and in animals as ________________.

Accepted Answer

A)   actin fibers pull the membrane inward until the two sides touch; the Golgi apparatus produces membrane bound vesicles filled with materials to make the cell wall.
B)   the Golgi apparatus produces membrane bound vesicles filled with materials to make the cell wall; actin fibers pull the membrane inward until the two sides touch.
C)   the centrosome produces membrane bound vesicles filled with materials to make the cell wall; the Golgi apparatus produces actin fibers to pull the membrane inward until the two sides touch.
D)   actin fibers interact to make the cell wall; the cleavage furrow pulls the membrane inward until the two sides touch.
E)   the Golgi apparatus produces a cleavage furrow; actin fibers pull the membrane inward until the two sides touch.F) A) and B)
G) C) and E)

Question 13

An oncogene is more likely to lead to cancer than a mutant tumor suppressor because

Accepted Answer

A)   a gain of function mutation in an oncogene need only occur in one allele before it disrupts control of the cell cycle.
B)   a loss of function mutation in an oncogene is sufficient to cause unregulated cell division.
C)   the mutant oncogene may inactivate telomerase.
D)   a gain of function mutation in a tumor suppressor gene can promote the cell cycle.
E)   a gain of function mutation in an oncogene is more likely to cause the other allele to mutate.F) B) and C)
G) C) and D)

Question 14

When during the cell cycle are chromosomes visible?

Accepted Answer

A)   only during interphase
B)   only when they are being copied
C)   during Mitosis
D)   only during the G1 phase
E)   Chromosomes are always visibleF) None of the above
G) All of the above

Question 15

In the absence of growth factors,the retinoblastoma (RB) protein binds a transcription activator called E2F,preventing the cell from entering S stage.A mutation in E2F occurs that causes RB to no longer bind it.This mutant E2F would be considered a(n)

Accepted Answer

A)   oncogene.
B)   proto-oncogene.
C)   tumor supressor.
D)   gain-of-function mutant.
E)   growth factor.F) C) and D)
G) None of the above

Question 16

Which of the following statements is correct regarding the events of the cell cycle?

Accepted Answer

A)   DNA is duplicated during the G1 and G2 phases.
B)   DNA replicates during cytokinesis.
C)   The M phase is usually the longest phase.
D)   Interphase consists of G1, S, and G2.
E)   The cell stops growing in G2 phase.F) C) and D)
G) A) and D)

Question 17

Ben was looking at onion root tip cells under the microscope in Biology class.He saw one cell that had two nuclei within it.What stage of the cell cycle was this cell in?

Accepted Answer

A)   anaphase
B)   interphase
C)   metaphase
D)   prophase
E)   telophase/cytokinesisF) A) and E)
G) C) and E)

Question 18

___________ are a type of internal signal molecule used in controlling the cell cycle.

Accepted Answer

A)   Kinases
B)   Histones
C)   Centromeres
D)   Actins
E)   NucleosomesF) A) and B)
G) C) and D)

Question 19

If a cell stops at the G1 checkpoint,this is most likely due to what problem?

Accepted Answer

A)   There is DNA damage.
B)   The DNA has not finished replicating.
C)   The chromosomes are not aligned properly.
D)   The cell is cancerous.
E)   There is no problem. The cell normally stops at the G1 checkpoint.F) A) and B)
G) A) and C)

Question 20

Unicellular organisms undergo mitotic division to

Accepted Answer

A)   repair damaged cells.
B)   increase the size of the organism.
C)   produce new organisms.
D)   increase the genetic variability of the population.
E)   produce gametes.F) B) and C)
G) A) and C)

Exam 8: Cellular Reproduction

___________ are a type of internal signal molecule used in controlling the cell cycle.

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All of the following statements are true about mitosis except

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The spindle serves two rolls in mitotic cell division.These are

Correct AnswerverifiedShow Answer

Unicellular organisms undergo mitotic division to

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Proteins that are involved in the regulation of the cell cycle,and that show fluctuation in concentration during the cell cycle,are called

Correct AnswerverifiedShow Answer

An oncogene is more likely to lead to cancer than a mutant tumor suppressor because

Correct AnswerverifiedShow Answer

If a cell stops at the G1 checkpoint,this is most likely due to what problem?

Correct AnswerverifiedShow Answer

A translocation may lead to cancer if it

Correct AnswerverifiedShow Answer

In the absence of growth factors,the retinoblastoma (RB) protein binds a transcription activator called E2F,preventing the cell from entering S stage.A mutation in E2F occurs that causes RB to no longer bind it.This mutant E2F would be considered a(n)

Correct AnswerverifiedShow Answer

Proto-oncogenes function by preventing cells from dividing uncontrollably.

Correct AnswerverifiedShow Answer

If there are twenty centromeres in a cell,how many chromosomes are there?

Correct AnswerverifiedShow Answer

Cancer is a disorder in which some cells have lost the ability to control their

Correct AnswerverifiedShow Answer

Ben was looking at onion root tip cells under the microscope in Biology class.He saw one cell that had two nuclei within it.What stage of the cell cycle was this cell in?

Correct AnswerverifiedShow Answer

A mutation results in a cell that no longer produces a normal protein kinase for the M-phase checkpoint.Which of the following would likely be the immediate result of this mutation?

Correct AnswerverifiedShow Answer

Which of the following statements is correct regarding the events of the cell cycle?

Correct AnswerverifiedShow Answer

Cytokinesis in plants occurs as _______________ and in animals as ________________.

Correct AnswerverifiedShow Answer

Which of the following is not a characteristic of cancer cells?

Correct AnswerverifiedShow Answer

A mutation that causes a gain of function in a tumor suppressor gene would not likely cause cancer because a tumor suppressor protein

Correct AnswerverifiedShow Answer

When during the cell cycle are chromosomes visible?

Correct AnswerverifiedShow Answer

Which of the following organelles would be abundant and in close proximity to the cell plate in a plant cell undergoing cytokinesis?

Correct AnswerverifiedShow Answer

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Cytokinesis in plants occurs as _ and in animals as __.

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