Which one does not belong to the categories of exotoxin based on action?
A. Enterotoxin;
B. Cytotoxin;
Cardiotoxin;
D. neurotoxin
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Which is not right about toxins produced by the pathogenic bacteria?
All are proteins,
B. Some can act on nervous system,
C. They interfere physiological activities of host cells,
D. Some can cause damage to host cells.
Which bacterial enzyme of following ones is not associated with invasion?
A. Hyaluronidase;
B. beta-lactamases
C. IgA proteinase
D. staphylokinase
The nature of bacterial capsules is to __________________.
A. cause widespread blood clotting;
B. allow phagocytes to engulf these bacteria;
C. affect the virulence of these bacteria;
D. have no effect on the virulence of bacteria
Which one of the following pathogens are most likely to cause severe infectious disease?
A. opportunistic pathogens in a weakened host;
B. pathogens lacking the enzyme kinase;
C. pathogens lacking the enzyme collagenase;
D. highly virulent microorganisms
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