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DNA precipitation out of a mixture of biomolecules can be achieved by treatment with:

1. Isopropanol
2. Chilled ethanol
3. Methanol at room temperature
4. Chilled chloroform

Correct answer: Chilled ethanol

Solution

DNA is commonly precipitated by adding chilled ethanol because it reduces the dielectric constant of the solution and, with salt present, allows DNA to aggregate and fall out. Chilled ethanol is the standard choice among the options listed.

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