What is the major difference between Gram-positive and Gram-negative bacteria?

Microbiologists use the Gram stain to aid in identification of bacteria.

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  • 9 years ago
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    Gram-positive bacteria turn purple in a Gram stain because their cell walls contain a peptidoglycan layer and a cell membrane. The chemicals are able to penetrate these two layers.

    Gram-negative bacteria contain an outer cell membrane, a peptidoglycan layer, and an inner cell membrane. The chemicals can't go through the cell wall as well and become pink.

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