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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.
This process is called osmosis. If high enough salt concentrations force the osmosis, it can dehydrate cells and cause them to die. (This is also why salt can be used to preserve meat) Much evidence has been found that throughout history, salt was actively used in order to prevent infections of wounds.