Bacteriophage have common properties except ()
A. parasite in living bacteria
B. DNA or RNA
C. widespread existence
D. high host-specific parasitism
E. less resistive than bacteria
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The streptococci classification basis is ()
A. ability to produce coagulase
B. the difference of pigment
C. the difference of flagella antigen
D. ability to hemolyse RBC on the blood agar plate
E. transmission route
The most potent toxin known in nature is ()
A. Plague toxin
B. Anthrax toxin
C. lecithinase
D. botulinum toxin
E. tetanospasmin
The main hiding site of HSV-1 is ()
A. labial skin
B. pharyngeal lymph node
C. spinal neural ganglia
D. N trigeminus
E. none of above
Virus can be observed through ()
A. light microscope
B. Eletron microscope
C. X-ray diffraction
D. centrifugation
E. filtration
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