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Why can DNA loss occur during gel extraction?

Answer and explanation

Correct answer: Because binding, washing, or elution may be incomplete

The governing concept is recovery efficiency during purification. In gel extraction, the desired DNA band is cut from agarose, dissolved or processed, bound to a purification membrane, washed, and finally eluted. At each stage some DNA can remain in the gel, fail to bind efficiently, be lost during washing, or remain on the membrane instead of entering the elution buffer. Consequently, recovery is usually less than 100%, and careless band excision or incomplete elution can increase the loss. Option A correctly identifies these causes. DNA does not automatically multiply during extraction, agarose does not make protein, and enzyme formation is unrelated.

Related tags

Gel-ExtractionDna-RecoveryPurificationCutting Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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