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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 otherproteins.
D) Both A and B are true.
E) Both B and C are true.
Biology Chapter 12
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