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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.
Finally alcohol can be added so that the DNA can be seen, but first it is crucial to know why the addition of alcohol is such an important step. This step is closely related to a process called precipitation, which is  the process of separating a substance from a solution as a solid (answers.com, precipitation).ctually the real reason for using alcohol in a DNA extraction is to precipitate (NOT RAIN) the DNA, as you may have realized when you did the experiment, the Alcohol step is the last step that brings the DNA to the surface.