The Cell Wall of a Gram-Positive Bacterium is Composed of a Thick

Question

The cell wall of a Gram-positive bacterium is composed of a thick ________ layer.
A) protein
B) poly-β-hydroxybutryic acid (PHB)
C) lipopolysaccharides (LPS)
D) peptidoglycan

Accepted Answer

The cell wall of Gram-positive bacteria is composed of a thick layer of peptidoglycan, whereas Gram-negative bacteria have a thinner layer of peptidoglycan surrounded by an outer membrane containing lipopolysaccharides. Choice A (protein) and B (poly-β-hydroxybutryic acid) are not components of the Gram-positive cell wall, and Choice C (lipopolysaccharides) is a component of the Gram-negative cell wall, not the Gram-positive cell wall.