BCHM 3P01 Lecture Notes - Lecture 8: Light-Independent Reactions, Aldehyde, Aldose
Document Summary
Allows atp production to be decoupled or independent from nadph. Atp synthesis by photophosphorylation: the transport of 3 protons out of the lumen back to the stroma (through the. Atp synthase) results in the production of one atp: 4 atp (requiring 12 h+) can be produced per o2 evolved, which requires about 8 photons, thus cyclic vs noncyclic photosynthesis offers different efficiencies to atp production. Noncyclic: 8 photons = 12h+ = 4atp or 0. 5 atp per photon. Atp synthesis by photophosphorylation: cyclic transport, while more efficient for atp production missed out on the ability to produce nadph, which contains large amounts of potential energy, each nadph has enough energy to produce 3 atp, so 2. Nadph (produced from nonyclic transport) boosts the previous numbers from 4 atp to 10 atp per 8 photons, or roughly 1. 25atp per photon: thus noncyclic is about 2x more efficient than cyclic.