What are the subunits of DNA and what is their function?

Answer;

Nucleotides are the sub units of DNA, their function is to form the genetic code.

Explanation; Nucleotides are the subunits of DNA. The four nucleotides are adenine, cytosine, guanine and thymine. Each of the four bases has three components, a phosphate group, a deoxyribose sugar and a nitrogen-containing base. The four different nucleotides in DNA differ only in the nitrogenous base. The nucleotides bind together in specific pairs, adenine with thymine and cytosine with guanine. The function of nucleotides is to build DNA. The way they bind leads to the characteristic double helical structure of DNA. The order of the different nucleotides forms the genetic code.