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 a cyclin
E) the binding of PDGF to receptors on the cell surface

Question

Quizplus · Accepted Answer

Cyclin is degraded by proteolysis once its complex with Cdk has completed its work in the cell cycle, leading to a decrease in the amount of cyclin at a specific point in the cycle. This is necessary to prevent cells from continually dividing and to prepare them for the next phase of the cycle.

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