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What can be a challenge in large-fragment purification after restriction digest?

Answer and explanation

Correct answer: Shearing and low recovery

The governing concept is that high-molecular-weight DNA is mechanically fragile during electrophoresis, band excision, and purification. Large fragments can be sheared by repeated pipetting, vortexing, narrow tips, or excessive handling. They may also enter a gel slowly, remain partly trapped in the well, or be recovered inefficiently during extraction. These effects reduce the amount of intact DNA available for later ligation or analysis. Thus option A is correct: shearing and low recovery are realistic purification problems. Large DNA does not turn into protein, and a restriction digest does not imply that DNA is absent. Enzyme colour is not a meaningful determinant of purification success. Gentle mixing, suitable agarose concentration, careful loading, and minimized exposure to damaging conditions improve recovery.

Related tags

Large Dna FragmentShearingPurificationIsolation Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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