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Which check is most useful before cutting step after DNA isolation?

Answer and explanation

Correct answer: DNA purity and integrity check

The governing concept is substrate quality control before enzymatic digestion. Restriction enzymes work best when the DNA is sufficiently pure, intact, and present at a known concentration. Contaminants such as salts, phenol, proteins, or residual detergents can inhibit the enzyme, while sheared or degraded DNA can produce an unclear fragment pattern. A purity measurement, concentration estimate, and gel-based integrity check therefore provide useful evidence that the sample is suitable. Option A is correct. Cell colour is unrelated to the purified DNA reaction, agar must never be evaluated by taste, and enzyme smell is neither a valid safety practice nor a measure of enzyme activity. These checks cannot replace proper molecular quality control.

Related tags

Dna PurityDna IntegrityCutting StepCutting Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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