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46. Nystatin is a drug used for the treatment of diseases caused by
A. gram negative bacterium
B. gram positive bacterium
C. yeast
D. protozoan
47. Which is not an amino acid and peptide antibiotic?
A. Penicillin
B. Actinomycin
C. Bacitracin
D. Tetranactin
48. Cephalosporins and Penicillins interfere with which of the following?
A. Protein synthesis
B. DNA function
C. Cell membrane function
D. Cell wall synthesis
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
50. The compound(s) which act(s) as metabolic antagonist is/are
A. trimethoprim
B. sulphonamides
C. both (a) and (b)
D. none of these
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