Which stain demonstrates DNA?

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Multiple Choice

Which stain demonstrates DNA?

Explanation:
Staining methods that distinguish DNA from RNA rely on dyes that bind nucleic acids with selectivity. Methyl green-pyronin is specifically designed for this: methyl green binds to the DNA phosphate backbone and appears green, highlighting DNA-rich regions such as the nucleus, while pyronin Y stains RNA pink/red, illuminating RNA in the cytoplasm and nucleolus. This combination lets you see DNA content clearly—green DNA versus red RNA—making it the best choice for demonstrating DNA in tissue sections. The other stains don’t offer this selective DNA visualization: toluidine blue is a general basophilic stain, and acid fuchsin and basic fuchsin target other tissue components rather than DNA specifically.

Staining methods that distinguish DNA from RNA rely on dyes that bind nucleic acids with selectivity. Methyl green-pyronin is specifically designed for this: methyl green binds to the DNA phosphate backbone and appears green, highlighting DNA-rich regions such as the nucleus, while pyronin Y stains RNA pink/red, illuminating RNA in the cytoplasm and nucleolus. This combination lets you see DNA content clearly—green DNA versus red RNA—making it the best choice for demonstrating DNA in tissue sections. The other stains don’t offer this selective DNA visualization: toluidine blue is a general basophilic stain, and acid fuchsin and basic fuchsin target other tissue components rather than DNA specifically.

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