BY 108 Chapter Notes - Chapter 10: Light-Independent Reactions, C4 Carbon Fixation, C3 Carbon Fixation
Document Summary
Uses atp (from cyclic/noncyclic photophosphorylation) to power endergonic reactions. Uses reducing power of nadph to attach h to c atoms. Carbon fixation - co2 binds to ribulose 1,5-biphosphate (rubp) Rubp - 5-carbon sugar made from reassembling bonds of fructose 6- phosphate and glyceraldehyde 3-phosphate forms 2 molecules of 3-phosphoglycerate (pga) Process catalyzed by rubisco (ribulose biphosphate carboxylase/oxygenase) 3 co2 + 9 atp + 6 nadph + water >> glyceraldehydes 3-phosphate + 8 p + W/ 3 turns of calvin cycle, 3 co2 enters, 3 rubp regenerated, 1 glyceraldehyde 3-phosphate created. Uses enzymes that functions best under light. Glyceraldehydes 3-phosphate - 3-carbon sugar that can be converted to fructose 6-phosphate and glucose 1-phosphate in cytoplasm w/ reversed glycolysis reactions. Glucose 1-phosphates combined into insoluble polymer as starch when there"s high levels of glyceraldehydes 3-phosphate energy cycle - metabolisms of chloroplasts/mitochondria are related. Photosynthesis uses products of respiration as starting substrates. Respiration uses products of photosynthesis as starting substrates.
