The cell wall of a bacterium is composed of
Correct answer: A. peptidoglycan
- A. peptidoglycan
- B. cellulose
- C. chitin
- D. phospholipid
Explanation
Peptidoglycan, also called murein, is a mesh of sugar chains cross linked by short peptides, and it is unique to bacteria, which is why penicillin can block its synthesis and kill a growing bacterium without harming human cells. The Gram stain works by distinguishing a thick peptidoglycan layer from a thin one. A phospholipid bilayer is a membrane, not a wall.
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About Prokaryotic and Eukaryotic Cells
Prokaryotic cells lack a membrane-bound nucleus and complex membrane-bound organelles, whereas eukaryotic cells contain a nucleus, specialized organelles and a cytoskeleton. Comparisons include DNA organization, ribosomes, cell walls, size, division and examples such as bacteria, archaea, protists, fungi, plants and animals.
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