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What precaution is needed while cutting vector band from gel after restriction digestion?

Answer and explanation

Correct answer: Avoiding inclusion of a nearby unwanted DNA band

The correct precaution is to avoid cutting a nearby unwanted DNA band along with the vector band. If another DNA fragment is excised with the vector, the purified sample may be mixed, causing incorrect results in later ligation or transformation steps. Use the DNA ladder and expected fragment size to identify and cut only the target band with a clean scalpel. Cutting an overly large gel piece or including the ladder lane reduces purity; UV exposure should also be kept minimal because prolonged UV can damage DNA. Exam tip: in gel excision, check both the expected band size and the purity of the cut band.

Related tags

Restriction DigestionGel ElectrophoresisGel ExcisionVector DnaDna PurificationRecombinant Dna TechnologyCutting Of DnaProcesses Of Recombinant Dna Technology

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