Each of the following point about staphylococcus is right EXCEPT ____.
A. Most of them are the members of normal flora on the human skin.
B. They are Gram-positive.
C. They can tolerate the salt deposited on human skin by sweat glands.
D. They can tolerate the stomach acid.
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Which is the typical morphological property of staphylococcus?
A. Like beans in pairs
B. arrangement in cluster of grapes
C. arrangement in pairs
D. arrangement in chains
Each of the following point about coagulase-positive staphylococcus is right EXCEPT __.
A. They can clot blood plasma treated with anticoagulant;
B. Staphylococcus aureus is coagulase-positive;
C. Staphylococcus epidermidis is coagulase-positive;
D. Coagulase is an enzyme which could enhance the bacteria virulence.
What is suggested by the hemolytic cycle around the colony of Staphylococcus on bloody agar plate?
A. The RBCs are killed by the hemolytic toxin secretd by staphylococcus.
B. The staphylococcus in the colony is avirulent.
C. The RBCs are killed by the enterotoxin secretd by staphylococcus.
D. The RBCs are digested by the lipases of staphylococcus.
Which point is not applied to diffentiate S. aureus and S. epidermidis?
A. Pigment of colony
B. Arrangement under microscope
C. hemolytic cycle on bloody agar plate.
D. Coagulase test.
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