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What does a no-enzyme control show in restriction digestion?

Answer and explanation

Correct answer: The uncut DNA pattern in the absence of restriction enzyme

The governing concept is the use of a negative control in restriction digestion. A no-enzyme control contains the DNA and the reaction mixture but omits the restriction enzyme. Therefore, any band pattern observed in this tube represents the original, undigested DNA, including its initial form and possible pre-existing degradation. The enzyme-treated sample is compared with this control to identify bands produced by cleavage. Option A is correct because it shows the baseline uncut pattern. Option B is not measured by this control, option C confuses DNA with protein, and option D is incorrect because the buffer is normally still present.

Related tags

No-Enzyme ControlUncut DnaRestriction DigestionCutting Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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