43. Both penicillin and fluoroquinolones
A.bind to and inactivate a bacterial protein
B.inhibit the cross-linking of peptidoglycan
C.are inactivated by β-lactamase
D.must be transported into the cytoplasm in order to act

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44. A broad-spectrum antibiotic such as chloramphenicol is one that
A.kills both Gram positive and Gram negative bacteria
B.kills all bacteria
C.kills numerous types of microbes
D.kills all microorganisms

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45. Vancomycin inhibits peptidoglycan synthesis by binding
A.D-alanyl - D-alanine
B.alanine racemase
C.D-alanyl - D-alanine synthetase
D.amidase

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46. Nystatin is a drug used for treatment of diseases caused by
A.gram negative bacterium
B.gram positive bacterium
C.yeast
D.protozoan

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47. Which is not an amino acid and peptide antibiotic?
A.Penicillin
B.Actinomycin
C.Bacitracin
D.Tetranactin

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48. Cephalosporins and Penicillins interfere with which of the following?
A.Protein synthesis
B.DNA function
C.DNA function
D.Cell wall synthesis

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49. Bacterial cells susceptible to penicillium can be protected from destruction if the medium in which they are exposed is of
A.high osmotic pressure
B.low osmotic pressure
C.moderate osmotic pressure
D.high surface tension

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