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Why can DNA concentration decrease after gel extraction?

Answer and explanation

Correct answer: Because recovery from the gel is not complete and some DNA can be lost

Gel extraction requires several handling steps: identifying and cutting the desired band, dissolving or melting the agarose, binding DNA to a membrane or resin, washing away impurities, and eluting the DNA. At each stage, a fraction of the DNA may remain in the gel, fail to bind, be lost during washing, or remain in the column instead of entering the eluate. The final eluate may therefore contain less total DNA and a lower measured concentration than the starting sample. Option A is correct. DNA is not amplified during extraction, restriction enzymes do not become DNA, and agarose does not become protein; these make B, C, and D incorrect. Measuring the recovered sample again is important before ligation or another downstream reaction.

Related tags

Gel ExtractionDna RecoveryConcentration MeasurementPcr (Polymerase Chain Reaction)Pcr Polymerase Chain ReactionProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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