The Cell Cycle Is Regulated by Extracellular Signals Called Mitogens

Multiple Choice

The cell cycle is regulated by extracellular signals called mitogens.The cyclin that is most likely to be elevated directly in response to mitogen action is:

A) Cyclin A.
B) Cyclin B.
C) Cyclin H.
D) Cyclin D.
E) Cyclin E.