26. Quinolones are
A. antimetabolites
B. penicillin derivatives
C. bacteriostatic
D. broad-spectrum
27. Which of the following is not a semi-synthetic chemotherapeutic agent?
A. Ampicillin
B. Carbenicillin
C. Penicillin
D. Sulfonamide
28. Which of the following tests is used to determine the minimal lethal concentration?
A. Broth dilution test
B. Agar dilution test
C. Dilution susceptibility tests
D. All of these
29. The mode of action of polymyxin is to
A. inhibit protein synthesis
B. inhibit DNA synthesis
C. injury to the plasma membrane
D. inhibit folic acid synthesis
30. Polyene antibiotics are
A. large ring structures
B. β-lactam – thiazolidine ring
C. small ring structures
D. any of these
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