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Why can low salt condition be useful in elution buffer?

Answer and explanation

Correct answer: In releasing DNA from silica

The governing concept is reversible nucleic-acid binding to a silica membrane. Under high-salt and suitable alcohol conditions, DNA binds to silica in a spin column. During elution, the buffer usually has low salt and an appropriate pH, often near neutral or slightly alkaline. These conditions weaken the interaction between DNA and silica and allow the DNA to dissolve into the collected liquid. Therefore option A is correct. Low salt does not burn DNA, create a cell wall, or serve as a general protein-binding step, so options B, C, and D are incorrect. Elution efficiency also depends on buffer volume, contact time, pH, membrane dryness, and whether the sample is allowed to stand before centrifugation.

Related tags

Elution BufferLow SaltSilica ColumnIsolation Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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