Which of the following steps is NOT required for activating a cyclin-dependent kinase?()
A. Binds to its corresponding cyclin
B. Phosphorylated by Wee1 and CAK
C. Dephosphorylated by Cdc25
D. Binds to its corresponding CKI
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During G2 phase, regulatory proteins for mitosis such as___are intensive synthesized()
A. cyclin B
B. cyclin D
C. lamin B
D. lamin C
Centriole starts to duplicate itself at()
A. S
B. G2
C. M
D. G1
The time of____phase is the shortest one among all the phases of cell cycle ()
A. S
B. G2
C. M
D. G1
Haploid cells are cells with()
A. One set of chromosomes
B. Circular chromosomes
C. Two sets of chromosomes
D. Many sets of chromosomes
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