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Unformatted text preview: ELECTRON TRANSPORT CHAIN This is a series of carrier molecules that will pass electrons along, releasing energy step by step, small amounts per step. This energy will drive the generation of ATP. An electron transport chain always involves a membrane: Prokaryocytesthe plasma membrane Eukaryocytesthe inner mitochondrial membrane There are 3 classes of carrier molecules: Flavoproteins--proteins that contain flavin, a coenzyme derived from riboflavin (Vit. B 2 ) Cytochromes--proteins that contain a heme group Ubiquinones (Coenzyme Q)--small non-protein carriers All electron transport chains achieve the same goalreleasing energy as electrons are transferred from higher-energy compounds to lower-energy compounds. At the end of the chain is an inorganic molecule that accepts the electron and does NOT pass it on (terminal electron acceptor). In aerobic cells (including human cells), the terminal electron acceptor is oxygen. acceptor)....
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- Fall '09