Answer :
Final answer:
Gram-positive bacterial cell walls are mainly composed of peptidoglycan, providing strength to the cell.
Explanation:
Gram-positive bacterial cell walls are primarily composed of peptidoglycan, which can make up to 90% of the cell wall. This polymer consists of N-acetylglucosamine linked to N-acetylmuramic acid and peptide units, creating a strong structure around the cell membrane.
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Peptidoglycan, it acts as a strong protective barrier for bacteria