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What strategy can separate very close fragment sizes in restriction digest?

Answer and explanation

Correct answer: Longer run and suitable agarose percentage

The direct answer is A: use a longer run and a suitable agarose percentage. DNA fragments that differ only slightly in size may travel almost together under ordinary conditions. Gel resolution can improve when the agarose concentration is selected for the expected size range and electrophoresis is allowed to run sufficiently long at suitable conditions. Option A is correct because both gel percentage and run time affect separation and band resolution. Option B is wrong because boiling can denature or destroy the restriction enzyme and will not separate bands. Option C is wrong because DNA does not become protein during electrophoresis. Option D is wrong because a ladder is needed to estimate fragment sizes; removing it does not improve the actual separation. Also avoid overloading the sample.

Related tags

Close FragmentsGel ResolutionRun Time

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