CH 461 Lecture Notes - Lecture 15: Ribulose, Oxidation State, Photon
Document Summary
This coupling is necessary because photosynthesis consumes a large amount of energy. To carry out the synthesis of a single molecule of glucose, the previous set of reactions must be carried out six times at a minimum. This requires the generation of six separate molecules of ribulose bisphosphate from ribulose phosphate, at the cost of one atp each. Furthermore, two molecules of 1,3 bisphosphoglycerate must be made from the two 3 phosphoglycerates that are the initial product of each co 2 fixation reaction. Conversion of each 1,3 bisphosphoglycerate requires an nadph as well; therefore, two nadph equivalents are consumed for each co 2 fixed. Another way of saying this is that carbon is reduced from an oxidation number of (cid:1679)4 in co 2 to an oxidation number of zero in carbohydrate (ch 2o). Therefore, synthesis of one mole of glucose requires the input of 18 atps and.
