Light Reaction Flashcards
Electron carries
Non protein cofactors that a there for reduction oxidation reactions. They are embedded in photosystem II, I, and the cytochrome complex.
Electron carriers example
Cytochromes, quinones and iron sulfur centers
Electron movement from photosystem II to the cytochrome
Facilitated by plastoquinone (PQ). Which serves the same function as ubiquinone
Cytochromes to photosystem I
Linked by mobile copper containing the protein plastocyanin
Ferredoxin
A protein that picks up the electrons from photosystem I
NADP+ reductase
An enzyme that takes the electrons from ferredoxin and uses them to make NADPH using 2 electrons and 1 proton
Electron flow
Easily oxidized to easily reduced. Except reactions centers start and are not easily oxidized
How do photosystems I and II react
The raised electrons by the photons of light cause them to become P700* and P680* respectively
P680+
Oxidized P680. It is reduced and donates and electron to water
P700+
Reduced back to P700 from electrons from photosystem II
ETC
Same as cellular respiration as a proton gradient across the thylakoid membrane forms
Process 1 of the ETC
Proton translocated into the lumen by by red/ox of plastoquinone
Process 2 of the ETC
2 protons added to the lumen by water being produced so the PQ can have more electrons.
Process 3 of the ETC
Removal of protons from stroma when NADP+ becomes NADPH
Proton motive force is established
Exact ATP synthase by chemiosmosis as cellular respiration
