Which is NOT a Component of a Gram-Negative Bacterium's Wall

Question

Which is NOT a component of a Gram-negative bacterium's wall?
A) peptidoglycan
B) teichoic acid
C) N-acetylmuramic acid
D) diaminopimelic acid
E) MurNac

Accepted Answer

Teichoic acid is a component of Gram-positive bacterial cell walls, not Gram-negative. Gram-negative bacteria instead have lipopolysaccharide (LPS) in their outer membrane, in addition to peptidoglycan, MurNac, diaminopimelic acid, and N-acetylmuramic acid in their cell walls.