Which of the following is most closely associated with a beta-lactam ring?
a. Penicillin
b. Vancomycin
c. Bacitracin
d. Isoniazid

검증된 단계별 안내

Understand that a beta-lactam ring is a specific chemical structure found in certain antibiotics, characterized by a four-membered lactam (a cyclic amide) ring.

Recall that beta-lactam antibiotics work by inhibiting bacterial cell wall synthesis, specifically targeting penicillin-binding proteins.

Identify which of the listed antibiotics contains this beta-lactam ring structure: penicillin, vancomycin, bacitracin, or isoniazid.

Recognize that penicillin is the classic example of a beta-lactam antibiotic, as it contains the beta-lactam ring essential for its antibacterial activity.

Conclude that among the options, penicillin is most closely associated with the beta-lactam ring.

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주요 개념

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Beta-lactam Ring Structure

The beta-lactam ring is a four-membered lactam (a cyclic amide) that is a key structural component of certain antibiotics. This ring is essential for the antibiotic's mechanism of action, as it interferes with bacterial cell wall synthesis by inhibiting penicillin-binding proteins.

Penicillin and Beta-lactam Antibiotics

Penicillin is a classic example of a beta-lactam antibiotic, characterized by the presence of the beta-lactam ring. These antibiotics target bacterial cell wall synthesis, making them effective against many Gram-positive bacteria by disrupting peptidoglycan cross-linking.

Differences Among Antibiotics Listed

Vancomycin, bacitracin, and isoniazid differ structurally and mechanistically from beta-lactam antibiotics. Vancomycin inhibits cell wall synthesis but lacks a beta-lactam ring; bacitracin interferes with cell wall precursors; isoniazid targets mycolic acid synthesis in mycobacteria.

Which of the following is most closely associated with a beta-lactam ring?a. Penicillinb. Vancomycinc. Bacitracind. Isoniazid