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How can gel purification remove uncut plasmid in restriction digest?

Answer and explanation

Correct answer: By separately excising the cut linear plasmid band

After restriction digestion, uncut plasmid and the cut linear plasmid can have different mobilities on a gel because they have different conformations. Excising and eluting only the desired linear plasmid band leaves the uncut-plasmid band behind. Cutting out all bands together would defeat the purpose of separation. Exam tip: in gel purification, select the band that matches the expected size and form of the desired DNA product.

Related tags

Restriction DigestionGel PurificationPlasmid DnaLinear PlasmidAgarose GelDna SeparationCutting Of DnaProcesses Of Recombinant Dna Technology

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