Antibiotics 101
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Questions and Answers

What is the mechanism of action of chloramphenicol?

  • Inhibits microbial cell wall synthesis
  • Inhibits microbial RNA synthesis
  • Inhibits microbial protein synthesis (correct)
  • Inhibits microbial DNA synthesis

    • What is the spectrum of antimicrobial activity of chloramphenicol?

  • Active against both gram-positive and gram-negative organisms (correct)
  • Not active against any organisms
  • Active against gram-positive organisms only
  • Active against gram-negative organisms only

    • What is the cause of clinically significant resistance to chloramphenicol?

  • Decreased permeability of the microbial cell membrane to the drug
  • Increased efflux of the drug from the microbial cell
  • All of the above
  • Inactivation of the drug by microbial enzymes (correct)

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