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BIO NMDCAT Carbohydrates
nmdcat.online June 27, 2026

The cell walls of bacteria are structurally reinforced by peptidoglycan, a macromolecule that contains a carbohydrate backbone composed of alternating units of

A. N-acetylglucosamine and N-acetylmuramic acid
✓
B. Glucose and galactose linked by β-1,4 bonds
C. Fructose and mannose linked by α-1,2 bonds
D. Ribose and deoxyribose linked by phosphodiester bonds

📝 Explanation

Peptidoglycan (murein) is unique to bacteria. Its carbohydrate backbone is a linear chain of alternating N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM) linked by β-1,4 glycosidic bonds. Lysozyme hydrolyzes this specific bond.

📖 Additional Information

  • N-acetylglucosamine and N-acetylmuramic acid
  • Glucose and galactose linked by β-1,4 bonds
  • Fructose and mannose linked by α-1,2 bonds
  • Ribose and deoxyribose linked by phosphodiester bonds

Peptidoglycan (murein) is unique to bacteria. Its carbohydrate backbone is a linear chain of alternating N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM) linked by β-1,4 glycosidic bonds. Lysozyme hydrolyzes this specific bond.

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