The Gram stain works because of differences in the ________ of bacteria.
A) genetic characteristics
B) cell walls
C) cell membranes
D) antigens
E) capsules

Question

Quizplus · Accepted Answer

The Gram stain differentiates bacteria based on the thickness and composition of their cell walls. Gram-positive bacteria have a thick peptidoglycan layer in their cell wall that retains the crystal violet stain, while Gram-negative bacteria have a thinner peptidoglycan layer with an outer membrane that doesn't retain the stain and instead takes up the counterstain, safranin.

The Gram Stain Works Because of Differences in the ________