83. What is the key functional group present in penicillins that is essential for their antibacterial activity?
(A) amide
(B) carboxyl group
(C) B-lactam ring
(D) ether
(E) thiophene group
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統計: A(0), B(1), C(3), D(0), E(1) #3421278
統計: A(0), B(1), C(3), D(0), E(1) #3421278