The replication of retroviruses proceeds by ()
A. synthesis of a DNA strand from the RNA template utilizing viral DNA polymerase
B. synthesis of a DNA strand from the RNA template utilizing host DNA polymerase
C. synthesis of a DNA strand from the RNA template utilizing viral RNA polymerase
D. synthesis of a DNA strand from the RNA template utilizing host RNA polymerase
E. none of the above
查看答案
Which of the following are the first products produced by HIV? ()
A. RNA
B. DNA
C. protein
D. envelop
E. none of the above
Which part of viral replication cycle characterizes eclipse phase? ()
A. attachment
B. penetration
C. uncoating
D. synthesis of viral components
E. none of the above
Which complement has function of opsonization()
A. C1q
B. C1r
C2a
D. C3b
E. C5a
Which cytokine has the inhibitory function ()
A. TGF-β
B. EGF
C. VEGF
D. NGF
E. PDGF
微信支付 
支付宝支付