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During the process of isolation of DNA, chilled ethanol is added to

1. Remove proteins such as histones
2. Precipitate DNA
3. Break open the cell to release DNA
4. Facilitate action of restriction enzymes

Correct answer: Precipitate DNA

Solution

DNA is much less soluble in chilled ethanol than in aqueous solution, so it aggregates and precipitates. This allows the DNA to be separated from the rest of the cell contents.

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