Explanation: DNA nucleotides are made up of three components: deoxyribose, phosphate group and a nitrogenous base. The nitrogenous bases found in DNA are Adenine, guanine, cytosine and thymine. The DNA is a double-stranded helical structure in which the phosphate group and deoxyribose make up the phosphodeoxyribose backbone that forms the rail of the helix while the nitrogenous bases that pair with one another form the rungs of the helix. In the base pairing, cytosine pairs with guanine and thymine pairs with adenine.
