The respiratory chain consists of four large multi protein complexes(, Il, III, and IV; three being proton pumps) and two mobile electron carriers ubiquinone( q or coenzyme Q, and cytochrome c Prosthetic groups acting in the proteins of respiratory chain include flavins(FMn, FAD) hemes(heme A, iron protoporphyrin IX, heme C) iron-sulfur clusters(2Fe-2S, 4Fe-4S), and copper• The respiratory chain consists of four large multi￾protein complexes (I, II, III, and IV; three being proton pumps) and two mobile electron carriers, ubiquinone (Q or coenzyme Q, and cytochrome c. • Prosthetic groups acting in the proteins of respiratory chain include flavins (FMN, FAD), hemes (heme A, iron protoporphyrin IX, heme C), iron-sulfur clusters (2Fe-2S, 4Fe-4S), and copper