Cdk4/cyclin D functions in()
A. G1 phase
B. G2 phase
C. M phase
D. S phase
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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
Which is wrong about the structure of testis? ()
A. Thetunica albuginea is thickened on the posterior surface of testis to form mediastinum
B. The fibrous septa from mediastinum penetrates radially the testis, dividing it into pyramidal lobules
C. Each lobule is occupied by 1-4 seminiferous tubules
D. Theseminiferous tubules go into mediastinum testis to form rete testis
E. The tubulus rectus go into mediastinum testis to form rete testis
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