Why is penicillin selectively toxic to bacterial cells but harmless to human cells?
a. Penicillin is inactivated within lysosomes of human cells
c. The glycocalyx of an animal cell provides a barrier through which penicillin cannot pass
d. Penicillin specifically weakens peptidoglycan, which is found only in bacterial cells
e. Human cells actively transport penicillin out of the cell
Ans: d. Penicillin specifically weakens peptidoglycan, which is found only in bacterial cells
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