At the start of an electron transport chain, an electron is passed to the protein carrier in the chloroplast or mitochondria
The electron comes from chlorophyll in photosynthesis and a coenzyme in respiration
The electron is then passed along protein carriers in the membrane
Each carrier becomes reduced and oxidised as it passes the electron along
At the end of the chain, the electron reduces a final acceptor
Energy is released as it is passed along, and the electron loses energy
Energy from the electron transport chain is used to transport hydrogen ions across the membrane. Hydrogen ions are pumped across by proteins
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