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.
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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.
Which enzyme produced by S. aureus can break the structure of penicillin and induce drug-resistant?
A. Hyaluronidase;
B. Staphylokinase;
C. Lipases ;
D. β-lactamase
Which enzyme can hide S produced in blood to escape the elimination of immune cells?
A. Hyaluronidase;
B. Staphylokinase;
C. Lipases ;
D. coagulase
How does Staphylococcus aureus affect the matrix between cells in the human body?
A. aureus triggers blood clotting, which coats the matrix and inhibits cellular communication.
B. aureusproduces an hyaluronidase that dissolves hyaluronic acid and thus enables it to pass between the cells.
C. aureusdoes not affect the matrix but instead produces a necrotizing agent that dissolves body cells.
D. aureuspossesses a hyaluronic acid capsule that causes leukocytes to ignore the bacterium as if it were camouflaged.
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