Which of the Following Describe(s)cyclin-Dependent Kinase (Cdk)

Multiple Choice

Which of the following describe(s) cyclin-dependent kinase (Cdk) ?

A) Cdk is inactive, or "turned off," in the presence of cyclin.
B) Cdk is present throughout the cell cycle.
C) Cdk is an enzyme that attaches phosphate groups to other proteins.
D) Cdk is inactive, or "turned off," in the presence of cyclin and it is present throughout the cell cycle.
E) Cdk is present throughout the cell cycle and is an enzyme that attaches phosphate groups to other proteins.