If a given protein’s level peaks early in G1, but is absent before the G2 transition, what can be inferred about its possible role in regulating the cell cycle?
a. This protein inhibits Cdk1.
b. This protein activates Cdk1.
c. This protein inhibits Cdk2.
d. This protein activates Cdk2.
e. This proteins is involved in DNA synthesis.
ANSWER: d
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