Trace the path of an electron from its origins atthe reaction center of photosys

Question

Trace the path of an electron from its origins atthe reaction center of photosystem II to its final electronacceptor at the end of photosystem I. Be able to name the mainmolecules involved in the process (this does not include theindividual molecules within the ETCs). Describe any actual‘work’ that the electron does on its journey. Selectone location in this process of linear electron flow, and describethe free energy level, entropy level, and potential to do work ofthe electrons at that location relative to an adjoining location inthe path. Finally, explain how electrons are replaced at thereaction center pigment molecules, and describe the role that REDOXreactions play in the process of electrons moving through thechains.

Explanation / Answer

This is not everything, but hopefully it will help. InPSII Light hits an electron which energizes it and it binds topheophtyin. The PQ then carries it to the cytochrome complexwhich takes the electron and gives the PQ protons which it bringsto the lumen which then causes ATP to be produced. Theelectron loses energy from this process. Then in PS I, lighthits the electron and which goes to Ferrodoxin and then a NADP+reductase enzyme and 2 electrons and and a proton go to NADP+causing NADPH to be formed. The electron is replaced throughphotolysis which is 2 H2O>4H-+O2+4 e-.

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