what are the basic unit or monomer of dna of dna
The monomers of DNA are called nucleotides, and the polymer is a polynucleotide. There are four different nucleotides in DNA called A, T, G, and C for the nitrogenous base sidegroup (adenine, thymine, guanine, and cytosine respectively) attached to the sugar-phosphate backbone (deoxyribose-phosphate) of a nucleotide.