Trace the flow of electrons in photosystem II from water lo reduced plastoquinon

Question

Trace the flow of electrons in photosystem II from water lo reduced plastoquinone (Q) by moving the term to the appropriate blanks in the sentences below. Two terms ml be used more than once. Photons break the bonds in two molecules, yielding four protons, four, and O2. A Tyr residue transfers electrons to, forming. is exerted, forming. P680* transfers an electron to, yielding and Pheo". Pheo" donates an electron to. Two each transfer an electron to QB, which, along with protons from the stroma, forms.

Explanation / Answer

Photons break the bonds in two WATER molecules, yielding four protons, four ELECTRONS, and O2.
A Tyr residue transfer electrons to P680+, forming P680.
P680 is excited, forming P680*.
P680* transfers an electron to PHEOPHYTIN, yielding P680+ and Pheo-.
Pheo- donates an electron to QA.
Two QA- each transfer an electron to QB, which, along with protons from the stroma, forms QBH2.

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