[[Nucleotide]]s are [[organic molecule]]s that serve as the monomers, or subunits, of [[nucleic acid]]s like [[DNA]] and [[RNA]]. The building blocks of [[nucleic acid]]s, nucleotides are composed of a nitrogenous base, a five-carbon sugar ([[ribose]] or [[deoxyribose]]), and at least one [[phosphate]] group. Thus a [[nucleoside]] plus a phosphate group yields a nucleotide.{{ ::nucleotide.png?400|}}