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EDITED!
Peptidoglycan is a compound in the cell walls of many bacteria. Which of the following elements are most abundant in peptidoglycan?

A. Aluminum and sodium
B. Carbon and hydrogen
C. Chlorine and iron
D. Iodine and potassium

Peptidoglycan (murein) is a polymer consisting of sugars and amino acids that forms a mesh-like layer outside the plasma membrane of most bacteria, forming the cell wall. The sugar component consists of alternating residues of β-(1,4) linked N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM) Carbon and hydrogen are most comely  found in them. So the answer is B.

Hope this helped! <3

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