A 49-year-old man is suffering from hypertension, and he has a history of atrial tachycardia. In selecting a calcium channel blocker to manage the tachycardia, the most appropriate agent would be ( )
Amlodipine
B. Isradipine
C. Nifedipine
D. Propranolol
E. Verapamil
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Which of the following is NOT a way that a bacterium can acquire antibiotic resistance? ( )
Acquiring resistance gene from its host’s cells
B. On its own through evolution
C. From its parent cell
D. Scavenging resistance genes from the environment
E. By changing target structure
Which of the following combinations would most likely contribute to the development of a superinfection? ( )
A. long-term use of narrow-spectrum antimicrobials
B. long-term use of broad-spectrum antimicrobials
C. short-term use of narrow-spectrum antimicrobials
D. short-term use of broad-spectrum antimicrobials
E. rational use under the guidance.
Which of the following does not bind to the 50S ribosomal subunit? ( )
A. tetracyclines
B. lincosamides
C. macrolides
D. chloramphenicol
E. Vancomycin
Which of the following antimicrobials inhibits the activity of DNA gyrase? ( )
A. polymyxin B
B. clindamycin
C. nalidixic acid
D. rifampin
E. Penicllin G
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