What differentiates gram-positive bacteria from gram-negative bacteria?

Question

Quizplus · Accepted Answer

Gram-positive bacteria have a thick layer of peptidoglycan in their cell wall, which retains the crystal violet stain used in the Gram staining procedure. Gram-negative bacteria have a thinner layer of peptidoglycan and an outer membrane composed of lipopolysaccharides, which causes them to lose the crystal violet stain and take up the counterstain safranin. The other options do not differentiate between gram-positive and gram-negative bacteria.

What Differentiates Gram-Positive Bacteria from Gram-Negative Bacteria