Cyclin-Dependent Kinase (Cdk) Is ________

Multiple Choice

Cyclin-dependent kinase (Cdk) is ________.

A) inactive, or "turned off," in the presence of cyclin
B) present only during the S phase of the cell cycle
C) an enzyme that removes hydroxyl groups from growth hormones
D) the enzyme that catalyzes the attachment of chromosomes to microtubules
E) an enzyme that attaches phosphate groups to other proteins