Respuesta :

DNA has four nitrogen bases such as adenine (A), guanine, cytosine, and thymine. The A of DNA shows the adenine nitrogen base of the DNA, which is a purine in nature.

What is DNA?

Because DNA is a polymer, it is made up of monomers of nucleotides. The nucleotide is made up of a deoxyribose (pentose) sugar, a phosphate, and a nitrogen base, and during the time of replication, these nucleotides come together. The DNA has four nitrogen bases such as adenine (A), guanine, cytosine, and thymine; out of these, two are purines (A and G) and two are pyrimidines (C and T).

Hence, the A of DNA is adenine, which has a nitrogenous base.

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