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 cyclin.
C)the degradation of cyclin.
D)synthesis of DNA.
E)an increase in the cell's volume-to-genome ratio.

Question

Quizplus · Accepted Answer

The decline of MPF activity at the end of mitosis is due to the degradation of cyclin. Cyclin is required for the activation of the protein kinase Cdk, and its degradation is necessary for the inactivation of MPF. Therefore, choice C is the correct answer. A, B, D, and E are not directly related to the regulation of MPF activity.

The Decline of MPF Activity at the End of Mitosis