The Chloroplast Electron Transport Chain
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The chloroplast's electron transport chain carries electrons from photosystem II to photosystem I, pumping hydrogen ions from the stroma into the thylakoid lumen.
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This chain parallels the mitochondrial chain, Bio 0550, but pumps ions into the thylakoid lumen instead of the intermembrane space.
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A second photosystem re-energizes electrons midway, unlike respiration's simple one-way loss to a final acceptor.