Penicillin kills susceptible bacteria by inhibiting the enzyme that builds the
- A. bacterial DNA
- B. bacterial ribosomes
- C. bacterial cell wall
- D. bacterial flagellum
Explanation
Penicillin blocks the transpeptidase that crosslinks the peptidoglycan wall, so a growing bacterium bursts under its own osmotic pressure. Human cells have no wall at all, which is why the drug is selectively toxic.
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