Nucleotides are considered monomers, the basic building blocks, that join together to form nucleic acids like DNA and RNA, which are polymers. Each nucleotide consists of three components: a nitrogenous base, a five-carbon sugar, and a phosphate group. When nucleotides link together through phosphate-sugar bonds, they create a long chain, resulting in the formation of nucleic acids. Thus, while nucleotides themselves are monomers, they come together to form polymers that are essential for genetic information storage and transmission.