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Which handling method is correct for high-molecular-weight DNA?

Answer and explanation

Correct answer: Gentle mixing

The governing concept is protection of DNA integrity during physical handling. High-molecular-weight DNA consists of very long strands, so it is especially vulnerable to mechanical shearing. Vortexing, forceful pipetting, repeated rapid mixing, and foaming can break those strands into smaller fragments. Gentle inversion or slow mixing distributes reagents while applying much less mechanical stress, allowing the DNA to remain sufficiently intact for electrophoresis, long-fragment analysis, or other applications. Therefore option D is correct. Rough vortexing and fast pipetting can shear DNA, while boiling can denature and damage it rather than preserve its high molecular weight.

Related tags

High-Molecular-Weight DnaGentle MixingDna IntegrityIsolation Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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