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Why should enzyme be kept last while making a restriction enzyme master mix?

Answer and explanation

Correct answer: To control activity start timing

The governing concept is controlled setup of an enzymatic restriction reaction. Restriction enzyme can begin cleaving DNA as soon as suitable buffer, salt, cofactors, temperature, and substrate are present. Adding the enzyme last, usually while keeping the mixture appropriately cold and mixing gently, minimizes the time during which some tubes could react before all tubes are ready. This improves consistency and helps synchronize the effective start of digestion. Therefore option A is correct. The enzyme is not added last to give it a colour, to turn buffer into a gel, or to convert DNA into RNA. Exact handling should follow the enzyme manufacturer’s instructions.

Related tags

Master MixEnzyme LastReaction TimingCutting Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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