Discussion
Peptidoglycan is made up of __________
Answer: D
Correct answer: N-acetylglucosamine, N-acetylmuramic acid and amino acids
Peptidoglycan has two parts. The backbone is an alternating chain of NAG and NAM, and short peptide chains of amino acids hang from each NAM and are cross-linked to those on neighbouring strands. Without the peptides there would be no cross-linking and no rigid mesh - which is exactly what penicillin prevents.
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