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When may DNA end repair be needed during restriction-digestion work?

Answer and explanation

Correct answer: When the DNA ends are unsuitable for the planned cloning strategy

DNA end repair is governed by the compatibility of DNA termini required for cloning. Restriction enzymes may generate sticky ends, blunt ends, or ends that do not match the ends of the vector or insert. If the planned ligation requires a different end structure, an appropriate repair or end-modification step can convert the termini into usable blunt or compatible ends. Thus, option A is correct because suitability for the cloning design is the deciding factor. Enzyme colour, the presence of a gel ladder, and sample labelling do not alter DNA-end compatibility and therefore do not create a need for end repair.

Related tags

Dna End RepairRestriction DigestionCloning StrategyCutting Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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