Gram-negative bacteria stain pink because
A) they have specialized lipids in their cell walls.
B) their peptidoglycan layer is thin.
C) their peptidoglycan layer is thick.
D) they are receptive to antibiotics.
E) their cell walls are composed largely of proteins.

Question

Quizplus · Accepted Answer

Gram-negative bacteria have a thin peptidoglycan layer in their cell walls. This thin layer allows the crystal violet stain used in the Gram staining procedure to be washed out, leading to the bacteria appearing pink or red after counterstaining with safranin.

Gram-Negative Bacteria Stain Pink Because