What causes the decrease in the amount of cyclin at a specific point in the cell cycle?
A)an increase in production once the restriction point is passed
B)the cascade of increased production once its protein is phosphorylated by Cdk
C)the changing ratio of cytoplasm to genome
D)its destruction by a process initiated by the activity of its complex with Cdk
E)the binding of PDGF to receptors on the cell surface

Question

Quizplus · Accepted Answer

Cyclin is degraded through a process initiated by the activity of its complex with Cdk, which marks it for destruction by the proteasome. As Cdk activity increases throughout the cell cycle, this leads to decreasing amounts of cyclin.

What Causes the Decrease in the Amount of Cyclin at a Specific