Multiple choice

Which of given organisms has murein as the major constituent of its cell wall?

  1. Algae

  2. Animals

  3. Plants

  4. Archaea

  5. Bacteria
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

Peptidoglycans (mucopeptides, glycopeptides, mureins) are the structural elements of almost all bacterial cell walls. They constitute almost 95% of the cell wall in some gram-positive bacteria and as little as 5 to 10% of the cell wall in gram-negative bacteria. Peptidoglycans are made up of a polysaccharide backbone consisting of alternating N-acetylmuramic acid (NAM) and N-acetylglucosamine (NAG) residues in equal amounts.

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