The Feulgen reaction demonstrates which of the following?

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Multiple Choice

The Feulgen reaction demonstrates which of the following?

Explanation:
The Feulgen reaction is specific for DNA because it uses acid hydrolysis to reveal aldehyde groups on the deoxyribose sugar in DNA, and then Schiff reagent binds these aldehydes to produce a magenta color. This staining pattern highlights DNA-containing structures like chromosomes and nuclei. RNA does not generate the same aldehyde reactive sites under these conditions, so it does not stain in the Feulgen reaction. Proteins and lipids lack the aldehyde groups produced by this method, so they remain unstained. Therefore, this reaction demonstrates DNA only.

The Feulgen reaction is specific for DNA because it uses acid hydrolysis to reveal aldehyde groups on the deoxyribose sugar in DNA, and then Schiff reagent binds these aldehydes to produce a magenta color. This staining pattern highlights DNA-containing structures like chromosomes and nuclei. RNA does not generate the same aldehyde reactive sites under these conditions, so it does not stain in the Feulgen reaction. Proteins and lipids lack the aldehyde groups produced by this method, so they remain unstained. Therefore, this reaction demonstrates DNA only.

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