Biology 1002B Lecture Notes - Lecture 8: Light-Independent Reactions, Photosystem Ii, Reduction Potential

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Heterotroph: an organism that cannot fix carbon and uses organic carbon for growth (doesn"t produce own food c-h bonds) Autotroph: is an organism that produces complex organic compounds (such as carbohydrates, fats, and proteins) from simple substances present in its surroundings, generally using energy from light (photosynthesis) or inorganic chemical reactions (chemosynthesis) Two phases: light reactions and calvin cycle: light reactions capture light energy by pigment molecules to synthesize nadph and atp. H2o provides electrons to reduce nadp+ to nadph; releases o2: calvin cycle uses electrons and protons from nadph to convert co2 into carbohydrate. Referred to as carbon fixation; reduction reaction. Photosystem uses energy from photons to oxidize reaction centre chlorophyll; electron transfers to primary electron acceptor and moves down etc. Definition of photosynthesis, light reactions, calvin cycle, redox potential, chloroplast, thylakoid membrane, lumen, p680, p700 (+ and * for each), chemiosmosis, Since it"s endergonic, the process is also anabolic.

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