LIFE 102 Lecture Notes - Lecture 19: Light-Independent Reactions, Carbon Fixation, Rubisco
Document Summary
*light reactions generate atp and increase the potential energy of electrons by moving them from water to nadph. *atp and nadph are produced on the side facing the stroma, where the. *the calvin cycle uses atp and nadph to convert carbon dioxide into sugar. *the calvin cycle, like the citric acid cycle, regenerates its starting material after molecules enter and leave the cycle. *the cycle builds sugar from smaller molecules by using atp and the reducing power of electrons carried by nadph. Carbon enters the cycle as carbon dioxide and leaves as a sugar named glyceraldehyde 3-phosphate (g3p) For net synthesis of 1g3p, the cycle must take place three times, fixing three molecules of carbon dioxide. Three phases of the calvin cycle: carbon fixation. Gaining energy: regeneration of the carbon dioxide acceptor. Alternative mechanisms of carbon fixation have evolved in hot, arid climates. *dehydration is a problem for plants, sometimes requiring trade-offs with other metabolic processes, especially photosynthesis.
