Discussion
Which of the following has peptidoglycan as a major constituent of cell wall?
Answer: B
Correct answer: Gram-positive bacteria
Peptidoglycan is the major constituent of the gram-positive wall - half or more of its dry weight, in many layers. Gram-negative bacteria have only a thin single layer, most of their wall being outer membrane, and fungal walls are made of chitin and glucans, with no peptidoglycan at all.
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