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Why is bead ratio important in bead cleanup of restriction fragments?

Answer and explanation

Correct answer: It affects which size fragments bind

The governing concept is magnetic-bead-based size selection. In a bead cleanup, the ratio of bead suspension to DNA solution changes the conditions under which nucleic acids bind to the bead surface. Different ratios can preferentially retain larger fragments, retain a wider size range, or leave smaller fragments in the supernatant, depending on the chemistry and protocol. Therefore option A is correct, and using the validated ratio is important for recovering the intended restriction fragment. The ratio does not rename or alter the restriction enzyme, transform DNA into protein, or make an agarose gel invisible. Other factors such as mixing, incubation, washing, and elution volume also influence recovery, but bead ratio is central to the size-selection window.

Related tags

Bead RatioSize SelectionDna RecoveryCutting Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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