cyclic photophosphorylation

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Involves only photo-system I (P 700)

light absorbed is passed to primary pigment.

e- from chlorophyll molecule passes to an excited state (photoactivation process)

excited electron is captured by e- acceptor and passed back to the chlorophyll molecule via a series of electron carriers

enough energy is released

synthesis of ATP from ADP occurs + synthesis of a an inorganic phosphate (chemiosmosis process)

ATP produced eventually passes to the light-independent / dark stage reactions