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salamualikumamp;#39; again so letamp;#39;s continue with the second part of the second lecture so in this lecture weamp;#39;ll talk about a number of things weamp;#39;ll talk about briefly about light absorbance of nucleic acids we will talk about the concepts of denaturation of DNA and three maturation and we will talk about a technique known as dot blot so in terms of light absorbance of nucleic acid it just happens that aromatic molecules chemicals have the ability to absorb light and it happens that aromatic pyrimidines and purines can absorb light in the UV range and the peak absorbance is at 260 nanometers so this is the wavelength of light that can be absorbed by pyrimidines and purines and if we do a comparison between single-stranded DNA and double-stranded DNA a in terms of the ability to observe white single-stranded DNA has the ability to absorb more light than double-stranded DNA okay so here we have so this this plot right here shows light absorbance so the same conce