試題詳解

52. Which of the following statements about cell cycle is FALSE?
(A) Cyclin is degraded during G1.
(B) Synthesis of cyclin begins in S phase.
(C) Cyclin combines with Cdk to produce maturation-promoting factor (MPF).
(D) MPF promotes mitosis by phosphorylating various proteins.
(E) MPF’s activity peaks during prophase of M phase.