After Gram staining, which color do Gram-positive bacteria appear?

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Multiple Choice

After Gram staining, which color do Gram-positive bacteria appear?

Explanation:
Gram-positive bacteria appear purple under the microscope after Gram staining. This happens because their thick peptidoglycan layer traps the crystal violet-iodine complex during the staining process and remains even after the alcohol decolorization step. The counterstain then colors Gram-negative bacteria pink or red, due to their thinner peptidoglycan layer. So, Gram-positive stay purple, distinguishing them from Gram-negative.

Gram-positive bacteria appear purple under the microscope after Gram staining. This happens because their thick peptidoglycan layer traps the crystal violet-iodine complex during the staining process and remains even after the alcohol decolorization step. The counterstain then colors Gram-negative bacteria pink or red, due to their thinner peptidoglycan layer. So, Gram-positive stay purple, distinguishing them from Gram-negative.

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