BIOL107 Lecture Notes - Lecture 10: Nicotinamide Adenine Dinucleotide, Hydrogenase, Atp Synthase

• School: University of Alberta
• Department: Biology (Biological Sciences)
• Course: BIOL107
• Professor: Frank Nargang

Document Summary

Occurs via calvin cycle (melvin calvin) in the stroma; uses 9atp and 6 nadph and h+ Three carbon dioxide react with three rubp, in a reaction catalyzed by rubisco. Three six carbon, two phosphate intermediates are formed. 6atp hydrolysed to 6adp +6pi, pi join cycle. 6nadph and 6h+ are oxidized to give 6nadp+ and 6 phosphate leave the cycle to give 6 g3p (3c, 1p) 5g3p rearrange to form 3 rubp, and 3atp are hydrolysed. Atp allows rearrangement of atoms, nadph and h+ reduces the fixed carbon dioxide. Rubp reacts with oxygen instead of carbon dioxide to give a 3 carbon molecule and glycolate, a. The further metabolism of glycolate requires oxygen consumption and produces carbon dioxide. Photosynthesis occurs at a high rate, so oxygen production is high, but stomata are closed to prevent water loss. So, oxygen: carbon dioxide ratio in the plant is high, and photorespiration occurs. Some plants use c4 photosynthesis or cam metabolism instead.