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What can leftover ethanol in a DNA sample do to later experiments?

Answer and explanation

Correct answer: It can inhibit PCR or enzyme reactions

The governing concept is that DNA purification must remove substances that interfere with downstream enzymes. Ethanol is commonly used during precipitation or washing, but if the DNA pellet is not dried adequately, residual ethanol remains in the sample. It can alter the reaction environment and inhibit DNA polymerase in PCR or other enzymes used for digestion, ligation, or measurement. Therefore option B is correct. Option A is wrong because ethanol does not reliably improve reactions. Options C and D describe biologically impossible transformations and are unrelated to purification. The pellet should be dried sufficiently, without excessive drying that makes DNA difficult to redissolve.

Related tags

Residual EthanolPcr InhibitionDna PurificationIsolation Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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