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1、 What statement about antigens presented on MHC class II molecules is correct?

A、Exclusively carbohydrates are presented by MHC II

B、Short peptides of 3-4 amino acids are presented by MHC II

C、Anchor residues can be at various distances from the termini

D、The length of the peptides bound by MHC class II molecules is not constraint

E、All of the statements are correct

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6、 In a mouse that has a C3 complement deficiency which complement-mediated effector mechanisms might be primarily affected?

A、Formation of the membrane attack complex

B、Enhancement of phagocytosis

C、Recruitment of phagocytic cells to the site of infection, promotion of inflammation

D、None of the above

E、All of the above

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11、 Which class of pattern recognition receptors senses viral RNA in the cytosol?

A、Toll like receptor

B、RIGI like receptors

C、C-type lectin receptors

D、Cytosolic DNA sensors

E、NOD like receptors

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17、（多选题） Which are possible routes of transmission for viral pathogens? Circle all that apply.

A、vector-borne (e.g. mosquito or ticks)

B、blood-borne

C、sexual

D、air-borne

E、fecal-oral

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