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Which ratio can indicate salt contamination in DNA sample before restriction digestion?

Answer and explanation

Correct answer: A260 by A230

The governing concept is spectrophotometric purity assessment at different absorbance wavelengths. The A260/A230 ratio is particularly useful for detecting substances that absorb near 230 nm, including several salts, phenol, guanidine, and carbohydrate-related contaminants. A lower-than-expected value can therefore warn that the DNA preparation may need cleanup before restriction digestion. Option B is correct. A260/A280 is more commonly interpreted for protein or phenol-related contamination and is not the best answer for the salt-focused wording. Temperature ratio and gel-voltage ratio are not standard indicators of chemical contamination in a DNA solution. The exact acceptable value depends on the method and sample, so the ratio should be interpreted with other quality checks.

Related tags

A260 A230Salt ContaminationDna PurityCutting Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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