DNA is replicated during()
A. G1 phase
B. S phase
C. Telophase
D. M phase
查看答案
Cdk4/cyclin D functions in()
A. G1 phase
B. G2 phase
C. M phase
D. S phase
Sarcomere is ()
A segment extending from one Z-line to the next Z-line in muscle fiber
B. A segment extending from one Z-line to the next Z-line in myofibril
C. A segment extending from one M-line to the next M-line in muscle fiber
D. A segment extending from one M-line to the next M-line in myofibril
E. A segment extending from one H band to the next H band in myofibril
During fertilization, spermatozoon enter ()
A. oogonia
B. primary oocyte
C. secondary oocyte
D. secondary follicle
E. primordial follicle
Which does not belong to seminiferous tubule? ()
A. Sertoli cell
B. interstitial cell
C. spermatogonium
D. primaryspermatocyte
E. spermatid
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