In a properly executed Gram stain,Gram positive organisms appear ________ while Gram negative organisms appear ________.
A)pink,clear
B)pink,purple
C)purple,pink
D)purple,blue

Question

Quizplus · Accepted Answer

Gram positive organisms appear purple because they have a thicker peptidoglycan layer in their cell wall that retains the crystal violet stain, while Gram negative organisms appear pink because their thinner peptidoglycan layer is unable to retain the stain and the counterstain (usually safranin) is able to penetrate their outer membrane.

In a Properly Executed Gram Stain,Gram Positive Organisms Appear ________