Question

Gram negative bacteria possess

A

Lipopolysaccharide and thick layer of murein

B

Lipopolysaccharide and thin layer of murein

C

No lipopolysaccharide and thick murein

D

No lipopolysaccharide and thin murein

Hard

Solution

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Correct option is B)

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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