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Why are DNA ends purified before ligation after restriction digestion?

Answer and explanation

Correct answer: To remove enzyme, buffer, and very small unwanted fragments

Purification before ligation cleans the DNA preparation after restriction digestion. The reaction mixture may contain restriction enzyme, salts, buffer components, glycerol, and very small unwanted DNA fragments. Some of these substances can inhibit DNA ligase, interfere with the required reaction conditions, or increase unwanted joining between fragments. Removing them leaves compatible vector and insert ends in a cleaner solution, improving the probability of productive recombinant-DNA formation. Thus, option A is correct. Purification does not destroy the desired DNA, so B is wrong. It does not add protein, eliminating C, and ethanol production has no role in this molecular-cloning step, eliminating D. The exact cleanup method may be a column, precipitation, or gel extraction depending on the experiment.

Related tags

Dna PurificationLigationRestriction DigestionRecombinant DnaCutting Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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