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Why is cold ethanol useful in DNA isolation?

Answer and explanation

Correct answer: To precipitate DNA

Cold ethanol lowers the solubility of DNA, causing it to come out of solution as a precipitate. In the presence of salt, the charge effect of DNA phosphate groups is reduced, so DNA can aggregate into visible thread-like strands. Option B is incorrect because ethanol is used to isolate DNA, not to destroy it. Exam tip: Remember cold ethanol primarily for DNA precipitation during DNA isolation.

Related tags

Dna IsolationDna PrecipitationCold EthanolRecombinant Dna TechnologyBiotechnologyIsolation Of DnaProcesses Of Recombinant Dna TechnologyClass 11 Mcq

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