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Which ion can EDTA chelate in DNA extraction?

Answer and explanation

Correct answer: Magnesium ion

The governing concept is chelation, in which EDTA binds metal ions through several coordinating groups and makes them unavailable in solution. In DNA extraction, EDTA commonly binds divalent cations such as Mg2+ and Ca2+. Magnesium is especially important because many nucleases require Mg2+ as a cofactor; removing it can reduce nuclease activity and help protect DNA from degradation. Therefore option A is correct. Helium is a gas rather than the relevant divalent metal ion, while chlorophyll is a pigment and starch is a carbohydrate granule, so options B, C, and D cannot be chelated in this context. EDTA must nevertheless be compatible with later enzyme reactions.

Related tags

EdtaMagnesium IonChelationIsolation Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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