Which of the following statements is true about cephalosporins and penicillins?
A) The chemical structure of the cephalosporins is completely different from that of the penicillins.
B) The mechanism of action of the cephalosporins is the same as that of the penicillins.
C) The cephalosporins are usually less resistant than the penicillins to the bacterial beta-lactamase enzymes.
D) The cephalosporins are used as substitutes for penicillins in the treatment of certain gram-positive infections.
Correct Answer:
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