In Ziehl-Neelsen staining, Mycobacterium appears which color?

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Multiple Choice

In Ziehl-Neelsen staining, Mycobacterium appears which color?

Explanation:
Ziehl-Neelsen staining tests acid-fastness, which is due to the waxy, mycolic-acid–rich cell wall of Mycobacterium. The primary dye (carbol fuchsin) is driven into the cells with heat, and because their cell walls resist decolorization by acid-alcohol, the red color is retained. After decolorization, a counterstain colors non–acid-fast organisms blue, leaving the acid-fast bacteria as red (often called pink). So the Mycobacterium appears red.

Ziehl-Neelsen staining tests acid-fastness, which is due to the waxy, mycolic-acid–rich cell wall of Mycobacterium. The primary dye (carbol fuchsin) is driven into the cells with heat, and because their cell walls resist decolorization by acid-alcohol, the red color is retained. After decolorization, a counterstain colors non–acid-fast organisms blue, leaving the acid-fast bacteria as red (often called pink). So the Mycobacterium appears red.

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