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Why are single-enzyme controls useful in double-digest troubleshooting?

Answer and explanation

Correct answer: To identify which enzyme is working

The governing concept is experimental control and isolation of variables. In a double digest, two restriction enzymes are present together, so an unexpected band pattern could result from either enzyme, an unsuitable buffer, incubation conditions, or an interaction between components. Running each enzyme separately on comparable DNA creates individual controls. If enzyme one cuts correctly but enzyme two does not, the troubleshooting can focus on enzyme two, its recognition site, activity, or compatibility. If neither works, the problem may involve the DNA or common reaction conditions. These controls do not colour DNA, evaporate buffer, or fold proteins; they identify the source of digestion failure.

Related tags

Single-Enzyme ControlDouble DigestTroubleshootingCutting Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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