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Why is gentle handling more important in genomic DNA cutting?

Answer and explanation

Correct answer: Genomic DNA is long and shear-sensitive

The governing concept is mechanical shearing of long DNA molecules. Genomic DNA consists of very long polymeric molecules that can be broken by vigorous vortexing, forceful pipetting, repeated transfer, or narrow tips. Such accidental fragmentation changes the starting material before the restriction enzyme acts and can produce a smear or an altered fragment distribution, making the intended digestion pattern difficult to interpret. Option A is correct. Genomic DNA is a nucleic acid, not a protein, and it carries a negatively charged phosphate backbone. It can migrate through an appropriate agarose gel, although very large molecules may require suitable gel conditions. Gentle mixing and wide-bore tips help preserve its integrity.

Related tags

Genomic DnaGentle HandlingDna ShearingCutting Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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