Article / Updated 09-27-2022
DNA is made up of long chains of nucleotides. To make a complete DNA molecule, single nucleotides join to make chains that come together as matched pairs and form long double strands. Each nucleotide is comprised of the following: A five-sided (pentose) sugar called deoxyribose A phosphate One of four nitrogen-rich bases: adenine, guanine, cytosine, or thymine Nucleotides are joined together by phosphodiester bonds.