AP Biologyeasymcq1 pt
Cyclins regulate the cell cycle by
A.activating cyclin-dependent kinases at specific phases
B.replicating DNA directly
C.forming the mitotic spindle
D.transporting chromosomes
Explanation
Core Concept
Cyclin levels oscillate; when a cyclin binds its Cdk, the kinase phosphorylates targets that advance the cycle. Cyclin destruction then resets the stage.
Correct Answer
Aactivating cyclin-dependent kinases at specific phases
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