题目内容

During the incubation period of an acute systemic virus infection, ( )

A. characteristic signs of virus infection appear
B. infectious virus cannot be isolated from any tissues
C. infectious virus cannot be shed
D. the host's immune response is stimulated by viral antigens
E. virus is limited to the site of inoculation

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Latency is an outcome particularly characteristic of which one of the following virus groups?

A. Polioviruses
B. Herpes viruses
C. Rhinoviruses
D. Influenza viruses

Which one of the following virus can cause vertical transmission?

A. HAV
B. CMV
C. Influenza virus
D. Rabies virus
E. Japanese B encephalitis virus

食品营养学中，根据蛋白质营养价值的高低，可将蛋白质分为（）（）（）三类。

根据机体氨基酸的来源，营养学上可将氨基酸分为（）、（）和条件必需氨基酸，条件必需氨基酸指（）和（）。