It sees the splitting of water to release molecular oxygen, and its main role is to convert the energy of photons into excited electrons which are transferred by organic compounds.
Joliot discovered the four-period oscillations in the synthesis of one product by this complex, and Kok developed the S-state model for that reaction. The site at which that reaction occurs contains a tetranuclear manganese-calcium cluster which transfers electrons to the Tyrosine-161 residue. This complex is almost always absent in heterocysts since its function is incompatible with nitrogen fixation. At its reaction center, this complex sees the transfer of a particle to (*) plastoquinone, which is shuttled to cytochrome b6f. It sees the splitting of water to release molecular oxygen, and its main role is to convert the energy of photons into excited electrons which are transferred by organic compounds. For 10 points, identify this complex used in the light-dependent reactions of photosynthesis, whose reactions precede those of Photosystem I.
Joliot discovered the four-period oscillations in the synthesis of one product by this complex, and Kok developed the S-state model for that reaction.
Photosystem {II} [or {PSII}; or {PS2}; or {P680}]