BIOL 102 Lecture Notes - Lecture 12: Carbon Fixation, Photoprotection, Redox
Document Summary
Photosynthetic pigments in thylakoid captivate light energy. Redox process h2o is oxidized & co2 is reduced. Endergonic process e boost from light e (change in g+) 3 phases: carbon fixation, reduction and rubp regeneration. Does not require light but requires atp and nadph from light dependent reactions. 13 reactions each catalyzed by different enzymes in the stroma. Co2 + ribulose phosphate (rubp, 5c) unstable 6c compound and rubisco 2x phosphoglycerate (pg, 3c) 2nd and 3rd phases: reduction and rubp regeneration. Pg glyceraldehyde-3-phosphate (g3p, 3c) sugar or rubp. Light e chemical e (atp & nadph) Light e is captured in photosystems i and ii big protein machines trap energy from light for electrons. Linear electron flow: 8 steps (light dependent, ps ii then ps 1, produces atp and nadph) Photon hits pigment in ps ii excited p680. Excited electron from p680 transferred to primary electron acceptor, electron is oxidized and turned into p680+ (this is called a redox reaction)
