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What is a DNA test? What is the purpose of RNA detection?

Diphenylamine is a reagent for DNA identification, and DNA will turn blue when it meets diphenylamine. When high school RNA is distributed in cells that recognize DNA and RNA, it is mixed with methyl green and pyrone to act on cells, DNA green and RNA red, but it is not recognized as DNA. It is estimated that methyl green and skin ketone are needed to observe RNA.