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An electron transport chain(ETC) couples a chemical reaction between an electron donor (such as NADH) and an electron acceptor (such as O2) to the transfer of H+ ions across a â¦ membrane, through a set of mediating biochemical reactions.
Best Answer: D. The electron transport chain is composed of various proteins that act as electron acceptors and donors. As high-energy electrons pass through it, they release a little bit of their energy a time. This energy is used to pump H+ against a concentration gradient, increasing their concentration on one side.est Answer: D. The electron transport chain is composed of various proteins that act as electron acceptors and donors. As high-energy electrons pass through it, they release a little bit of their energy a time. This energy is used to pump H+ against a concentration gradient, increasing their concentration on one side.