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Why is the reaction tube mixed gently during restriction digestion?

Answer and explanation

Correct answer: To mix DNA and enzyme evenly without mechanically shearing DNA

The governing concept is careful handling of DNA during reaction setup. Gentle mixing distributes DNA, enzyme, buffer, and salts throughout the small reaction volume, helping the components contact one another uniformly. At the same time, it avoids vigorous vortexing or rough pipetting, which can mechanically shear long DNA molecules and reduce the quality of the substrate. Option A is correct because it combines both requirements: homogeneity and protection from physical damage. Digestion is not intended to burn DNA or make it produce protein, and tube colour has no role in enzyme cleavage. Thus options B, C, and D are unrelated.

Related tags

Gentle MixingReaction SetupDna ShearingCutting Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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