The Gram-negative cell wall is characterized by presence of outer membrane, a thinner peptidoglycan layer and extensive periplasmic space surrounding the peptidoglycan. The uppermost layer of the outer membrane has lipopolysaccharide. The peptidoglycan layer is composed of a macromolecule peptidoglycan/murein which is a repeating framework of long glycan chains having alternate N-acetyl glucosamine and N-acetyl muramic acid.
Thus, the correct answer is option B.
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