What stain demonstrates DNA?

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Multiple Choice

What stain demonstrates DNA?

Explanation:
DNA visualization can be achieved with stains that specifically bind to DNA or react with its chemical components. The Feulgen reaction is the classic DNA-specific method: after precise hydrolysis, the deoxyribose sites on DNA react with Schiff reagent to produce a magenta color, making DNA identifiable wherever it is in the tissue or cells. Another approach is the methyl green-pyronin differential stain. Methyl green binds predominantly to DNA, giving a green color, while pyronin stains RNA pink. This combination highlights DNA-rich regions in green and RNA-rich regions in pink, effectively showing where DNA is located. Because both methods reveal DNA, the option that includes both Feulgen and methyl green-pyronin is the best answer.

DNA visualization can be achieved with stains that specifically bind to DNA or react with its chemical components. The Feulgen reaction is the classic DNA-specific method: after precise hydrolysis, the deoxyribose sites on DNA react with Schiff reagent to produce a magenta color, making DNA identifiable wherever it is in the tissue or cells. Another approach is the methyl green-pyronin differential stain. Methyl green binds predominantly to DNA, giving a green color, while pyronin stains RNA pink. This combination highlights DNA-rich regions in green and RNA-rich regions in pink, effectively showing where DNA is located.

Because both methods reveal DNA, the option that includes both Feulgen and methyl green-pyronin is the best answer.

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