Light dependent reaction

From The School of Biomedical Sciences Wiki
Revision as of 09:09, 26 November 2016 by Nnjm2 (talk | contribs) (Added in a lot of links (wikis need links). Corrected lack of superscript.)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigation Jump to search

The light dependent reaction is the first stage of photosynthesis. The process begins when a chlorophyll pigment in photosystem 2 (PS2) in the thylakoid membrane absorbs a photon from light. This causes the PS2 to be in an unstable state which causes an electron to pass from PS2 to cytochrome b6f to photosystem 1 (PS1) in a series of redox reactions (electron transport chain) down the thylakoid membrane.  Energy is lost at stages during the redox reaction, this energy is used to pump H+ ions across the thylakoid membrane from the stroma creatining an electrochemical gradient. H+ ions then flow back across membrane through ATP synthase which catalyses the reaction of ADP and Pi to form ATP. 

Retrieved from "https://teaching.ncl.ac.uk/bms/wiki//index.php?title=Light_dependent_reaction&oldid=16138"