In both mitochondrial and chloroplast electron transport chain, electrons leave proteinaceous carriers and leave the membrane. Name the four electron carriers that account for this statement. Solution ELECTRON TRANSPORT CHAIN:An electron transport chain (ETC) is a series of compounds that transfer electrons from electron donors to electron acceptors redox reactions, and couples this electron transfer with the transfer of protons across a membrane........... THE FOUR ELECTRON CARRIERS ARE: 1)NADH 2)FAD 3)ATP/ADP 4)PHOSPHATE.