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Quick Answer. Ethanol is used in DNA extraction to force the DNA to precipitate in a solution. In order to collect a DNA sample, cells are broken down through agitation, then mixed with water, salt and ethanol to create an aqueous solution.
DNA extraction is done by three methods: In organic extraction, phenol and chloroform are used to create on organic phase in which cells are lysed and DNA is freed. The DNA remains in the aqueous phase. Ethyl alcohol is used to precipitate the DNA. In the inroganic methos, NaCl and EDTA are used for cell lysis.Following this, an approach similar to the organic method is followed. In solid state extraction, DNA is first precipitated in the presence of high slat and low pH conditions.The precipitated DNA is then adsorbed on to a filter membrane surface.he DNA remains in the aqueous phase. Ethyl alcohol is used to precipitate the DNA. In the inroganic methos, NaCl and EDTA are used for cell lysis. Following this, an approach similar to the organic method is followed.