The Gram stain is a routine stain used in bacteriology to determine gram-positive and gram-negative bacteria based on the:

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Quizplus · Accepted Answer

The composition of the bacterial cell wall is routinely used in bacteriology.The peptidoglycan cell walls of the gram-positive bacteria retain the purple stain,whereas lipopolysaccharide cell walls of the gram-negative cells wash away the purple stain and stain pink with the counter stain.

The Gram Stain Is a Routine Stain Used in Bacteriology