Acridine orange is used as a stain for
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DNA and RNA
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proteins
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carbohydrate
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lipids
A
Correct answer
Explanation
Acridine orange is a metachromatic fluorescent dye that intercalates into nucleic acids. It binds to DNA emitting green fluorescence and to RNA emitting orange-red fluorescence when viewed under fluorescence microscope. This differential staining allows visualization of both DNA and RNA in cells.