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Why should very harsh mixing be avoided during alkaline lysis?

Answer and explanation

Correct answer: To keep chromosomal DNA contamination low

Alkaline lysis separates plasmid DNA from cellular material by using detergent and alkaline conditions, followed by neutralization. Plasmid DNA is small and circular, so it can often re-form correctly, whereas long chromosomal DNA is fragile and easily sheared. Vigorous vortexing or rough pipetting breaks chromosomal DNA into smaller pieces that remain in the solution and may contaminate the plasmid preparation. Gentle inversion mixes the reagents while limiting this shearing. Therefore option D is correct; the other choices do not explain the purpose of gentle handling.

Related tags

Alkaline LysisChromosomal DnaGentle MixingIsolation Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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