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26. Quinolones are

A. antimetabolites
B. penicillin derivatives
C. bacteriostatic
D. broad-spectrum

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27. Which of the following is not a semi-synthetic chemotherapeutic agent?

A. Ampicillin
B. Carbenicillin
C. Penicillin
D. Sulfonamide

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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

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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

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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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