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How do gram positive bacteria appear when dyed?

User Mcrumley
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Final answer:

Gram-positive bacteria appear purple when dyed because of their thick cell wall, while Gram-negative bacteria appear pink because of their thin cell wall.

Step-by-step explanation:

Gram-positive bacteria appear purple when dyed because they have a thick cell wall without an outer membrane, which allows them to retain the crystal violet dye used in the Gram stain process.

On the other hand, Gram-negative bacteria appear pink because their thin cell wall does not prevent the crystal violet from washing away during the decolorizing step, and they take up the pink counterstain safranin.

User FragmentalStew
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