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You always see nice diagrams of the four chemiosmosis complexes in, say, the inner membrane of a mitochondrion, all lined up in order (and in a straight line), each one eagerly awaiting the output from the previous one.
Does it really happen this way? Does the ubiquinone from a given complex 1 carry its very own little electron always to the same complex 2 and so on. Or can it go to any complex 2 within its range, whatever that may be?