Answer:
The correct answer will be option-D.
Explanation:
Deoxyribose nucleic acid or DNA is the genetic material of the organisms which is composed of nucleotide monomers. Each nucleotide monomer is made up of a fiver carbon sugar, four different nitrogenous bases and a phosphate group
The DNA bases can be easily distinguished on the basis of nitrogen element as the structure of purine which is adenine and guanine contains four nitrogen molecule whereas cytosine and thymine contain two nitrogen molecules in their structure.
Thus, option-D is the correct answer.
