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What is the main role of EDTA in DNA isolation?

Answer and explanation

Correct answer: Binding metal ions and protecting DNA from DNase

The governing concept is inhibition of metal-dependent nucleases during DNA extraction. EDTA is a chelating agent that binds divalent metal ions, especially magnesium ions. Many DNases require such ions as cofactors for catalytic activity. When EDTA sequesters them, nuclease activity is reduced and the isolated DNA is less likely to be degraded. Therefore option A is correct. EDTA does not cut DNA directly; restriction enzymes perform sequence-specific cutting. It does not illuminate the sample or convert protein into sugar. Its protective effect depends on binding the ions needed by enzymes that would otherwise damage DNA.

Related tags

EdtaDnase InhibitionDna ProtectionIsolation Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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