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What is the risk if a gel run is too long in restriction digestion?

Answer and explanation

Correct answer: Small fragments can run out of gel

The governing concept is size-dependent migration during agarose gel electrophoresis. DNA molecules move through the gel toward the positive electrode, and smaller fragments generally migrate faster than larger fragments. If electrophoresis continues too long, a small restriction fragment may travel beyond the lower edge of the gel and diffuse into the running buffer, making it difficult or impossible to visualize or recover. Therefore option A is correct. Run time should be selected according to gel percentage, voltage, dye-front position, and the size range being examined. A long run does not strengthen the enzyme, guarantee DNA purity, or transform buffer into DNA.

Related tags

Long Gel RunSmall FragmentsElectrophoresisCutting Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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