UBIQUINONE

[ubi.qui.none] n [blend of L ubique everywhere and E quinone; fr. its widespread occurrence in nature] (1958): any of a group of lipid-soluble quinones that contain a long isoprenoid side chain and that function in the part of cellular respiration comprising oxidative phosphorylation as electron-carrying coenzymes in the transport of electrons from organic substrates to oxygen esp. along the chain of reactions leading from the Krebs cycle