How does the protein Sic1 regulate the cell cycle?
a. Sic1 is a cyclin that binds to a Cdk to form a cyclin/Cdk complex, which regulates the G1 to S transition.
b. Sic1 inhibits an S phase cyclin/CDK complex required for synthesis to occur
c. Sic1 binds to a cyclin, to form a complex that regulates the G2 to M transition.
d. Sic1 is a growth factor that binds to external receptors and promotes the transition from G1 to S.
e. Sic1 is a cyclin that binds to a Cdk to form a cyclin/Cdk complex to regulate the G2 to M transition.
ANSWER: b
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