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How can insert size be confirmed by restriction digest?

Answer and explanation

Correct answer: By cutting with flanking enzymes and observing expected band

The governing concept is fragment-size analysis after diagnostic restriction digestion. Digesting a recombinant vector with enzymes that cut on either side of the insert releases that insert as a separate DNA fragment. When the products are separated by agarose gel electrophoresis, the insert band is compared with a DNA ladder of known fragment sizes. A band at the expected approximate length supports the proposed insert size; the vector band provides an additional consistency check. Therefore option A is correct. Smelling the sample gives no size information, freezing the enzyme does not measure DNA, and adding water alone cannot release or identify a fragment.

Related tags

Insert SizeFlanking DigestDna LadderCutting Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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