Biology 1202B Lecture Notes - Lecture 7: Cytosol, Carboxylation, Evaporation

• School: Western University
• Department: Biology
• Course: Biology 1202B
• Professor: Patrick Mc Donald

Document Summary

2 distinct processes: light reactions, calvin cycle. Nadph able to reduce other molecules: light reactions, calvin cycle. Reaction center differs: p680 in photosystem ll has an absorption peak at 680nm, p700 in pl at 700nm, once excited reaction center chlorophyll donates electron to primary. In other aspects they function the same acceptor. Excited p680* oxidized to p680+ by primary acceptor. P680+ reduced back to p680: oxygen evolving complex pulls electrons (2) from water and gives to p680+ Electron transport is a series of redox reactions. Plastoquinone (pq) is mobile: transports a proton across the membrane. Electron from pll primary acceptor passed to pq to cyto complex to plastocyanin. Light raises p700 to excited state and like p680 is oxidized by primary acceptor. Electron transfer through ferredoxin to nadp+ reductase: holds electron until a second travels chain, reduces nadp+ to nadph. Nadph available for calvin cycle in stroma. Proton gradient established by pq moving it across membrane and splitting of h2o.