試題詳解

9. Which of the following statements concerning eukaryotic cell cycle control is correct?
(A) Cell cycle follows the sequence of G1 -＞ G2 -＞ S -＞ M.
(B) M phase usually represents the longest period of the cell cycle.
(C) Cell cycle progression is controlled by cyclically fluctuating concentrations of cyclins in the cell.
(D) Cyclins are resistant to degradation in the cell.