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What kind of DNA is good for a positive control in restriction digest?

Answer and explanation

Correct answer: DNA with a known restriction site and expected fragment pattern

A positive control should contain a known recognition site for the restriction enzyme and should produce a predictable fragment pattern after digestion. Seeing the expected bands confirms that the enzyme, buffer, and incubation conditions are working properly. DNA lacking a site for that enzyme will not be cut, so it cannot verify enzyme activity as a positive control. Exam tip: a positive control must give a known expected result.

Related tags

Restriction DigestPositive ControlRestriction EnzymeDna DigestionGel ElectrophoresisCutting Of DnaProcesses Of Recombinant Dna TechnologyBiotechnology

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