Nucleotide

[Raeanne Dimick]

A subunit of nucleic acid (e.g, deoxyribonucleic acid[DNA] or ribonucleic acid[RNA]). It consists of a 5-carbon sugar, a phosphate group, and a nitrogenous base (e.g., thymine, guanine, cytosine, adenine, or uracil).
Also, they are integrated into the cofactors of enzymatic reaction.
Furthermore, in cellular signalling, they are involved as cyclic adenosine monophosphate and cyclic guanosine monophosphate.
Lastly, nucleotides can also be chemical energy sources in the form of adenosine triphosphate(ATP), a core of metabolism.

[Lanell]

one of a group of chemical compounds found in living cells in nucleic acids such as DNA and RNA

[Mary Mallozziberg]

A compound consisting of a nucleoside linked to a phosphate group. Nucleotides form the basic structural unit of nucleic acids such as DNA.