Maximum absorbance of DNA molecule is at . . . . . . . . O_A wave length.

Solution (By Examveda Team)

The maximum absorbance of DNA molecule is at 260 nm OA wavelength.
The ratio of absorbance at 260 nm and 280 nm is used to assess the purity of DNA and RNA.
The principle of the UV absorbance method is that nucleic acids (DNA or RNA) contain conjugated double bonds in their purine and pyrimidine rings that have a specific absorption peak at 260 nm.