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What approximate A260/A280 ratio is considered good for pure DNA?

Answer and explanation

Correct answer: About 1.8

The governing concept is the absorbance ratio used to estimate DNA purity. At 260 nm, DNA absorbs strongly, while protein contributes more strongly near 280 nm. For relatively pure double-stranded DNA, the A260/A280 value is commonly close to 1.8 under standard measurement conditions. A substantially lower value may indicate protein or reagent contamination, whereas an unusually high value can suggest other contaminants or measurement effects. Therefore option A is correct. Values of 0.2, 5.0, and 10.0 are not the usual exam reference for pure DNA. The ratio is an approximate quality indicator, not an absolute proof that every contaminant has been removed.

Related tags

A260/A280Pure DnaDna QualityIsolation Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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