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Which ratio can indicate protein contamination?

Answer and explanation

Correct answer: A260/A280

The governing concept is spectrophotometric assessment of nucleic-acid purity. Nucleic acids absorb strongly near 260 nm, whereas proteins, particularly because of aromatic amino acids, contribute substantially near 280 nm. The A260/A280 ratio therefore provides a practical indication of DNA purity. A lower-than-expected value for a DNA preparation can suggest protein or other absorbing contaminants, although interpretation also depends on buffer and sample conditions. Option D is correct. The other listed wavelength ratios are not the standard purity index used for detecting protein contamination in a routine DNA preparation. This measurement assesses quality; it does not itself remove the contaminant.

Related tags

A260/A280Protein ContaminationDna PurityIsolation Of DnaProcesses Of Recombinant Dna TechnologyBiotechnologyClass 11 Mcq

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