dNMP, or deoxyribonucleoside monophosphate, is a building block of DNA. It consists of a deoxyribose sugar, a nitrogenous base (adenine, guanine, cytosine, or thymine), and a phosphate group. The nitrogenous base determines the specific nucleotide, and these nucleotides are paired with their complementary counterpart to form the rungs of the DNA ladder.