The ratio of [tex]\frac{A_{260}}{A_{280}}[/tex] indicates the purity of nucleic acid.For pure DNA it should lie between 1.8-2.0.Whereas for RNA it should be greater than 2.
This is calculated for DNA using the given values of absorbance-
[tex]\frac{A_{260}}{A_{280}}[/tex]= 2.71
As the value is greater than 2.0,it reflects the RNA contamination in the sample.
