19. The cellular protein that occurs at cyclically fluctuating concentrations and regulates the cell cycle is_______
(A) cyclic AMP
(B) cyclin
(C) cyclin-dependent kinase
(D) G-protein
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統計: A(0), B(2), C(0), D(0), E(0) #3477339
統計: A(0), B(2), C(0), D(0), E(0) #3477339