The drug cytochalasin B blocks the function of actin. Which of the following aspects of the cell cycle would be most disrupted by cytochalasin B?

The drug cytochalasin B blocks the function of actin. Which of the following aspects of the cell cycle would be most disrupted by cytochalasin B? 

A) spindle formation
B) spindle attachment to kinetochores
C) DNA synthesis
D) cell elongation during anaphase
E) cleavage furrow formation and cytokinesis





Answer: E

A particular cell has half as much DNA as some other cells in a mitotically active tissue. The cell in question is most likely in

A particular cell has half as much DNA as some other cells in a mitotically active tissue. The cell in question is most likely in 

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




Answer: A

Which of the following does not occur during mitosis?

Which of the following does not occur during mitosis? 

A) condensation of the chromosomes
B) replication of the DNA
C) separation of sister chromatids
D) spindle formation
E) separation of the spindle poles


Answer: B

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

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

A) cells with more than one nucleus.
B) cells that are unusually small.
C) cells lacking nuclei.
D) destruction of chromosomes.
E) cell cycles lacking an S phase.





Answer: A

The decline of MPF activity at the end of mitosis is due to

The decline of MPF activity at the end of mitosis is due to 

A) the destruction of the protein kinase Cdk.
B) decreased synthesis of Cdk.
C) the degradation of cyclin.
D) the accumulation of cyclin.
E) synthesis of DNA.






Answer: C

One difference between cancer cells and normal cells is that cancer cells

One difference between cancer cells and normal cells is that cancer cells 

A) are unable to synthesize DNA.
B) are arrested at the S phase of the cell cycle.
C) continue to divide even when they are tightly packed together.
D) cannot function properly because they are affected by density-dependent inhibition.
E) are always in the M phase of the cell cycle.





Answer: C