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The hydrogen carrier PQ and the electron carrier PC are the mobile carriers in light reaction facilitating electron transfer from PS II to PS I during non-cyclic process.

My question is -

  1. How do they move in membrane, from PS II to cytochrome for PQ and cytochrome to PS I for PC? I do know the membrane is quasi-fluid in nature so it'll be easy for carriers to move in it but my question is how do they reach their destination? What's the driving force?

    Maybe they're just arranged that way on the membrane and some change like - because of change in density (when PQ accepts the H and converts to PQH2 ; I'm not sure about the density change part) which leads to change in side on which it's present or change in anything else, they reach their target?

Is my thinking correct?

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