21. More promising chemotherapeutic agents for treating viral diseases is
A. leukocytic interferon
B. fibroblast interferon
C. interferon
D. nystatin
22. A parenteral route of drug administration refers to
A. oral
B. nonoral
C. intravenously
D. intramuscularly
23. Which of the following antibiotics can’t be used for the treatment of infections with β-lactamase-producing Staphylococcus aureus?
A. Vancomycin
B. Ampicillin/sulbactam
C. Cephalothin
D. Piperacillin
24. Which of the following is not an aminoglycoside antibiotic?
A. Streptomycin
B. Neomycin
C. Kanamycin
D. Cephalosporin
25. The nitrofurans differ from the antibiotics in that they
A. does not occur naturally
B. occur naturally
C. are antimicrobial drugs
D. all of these