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

question 54

Multiple Choice

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