Light dependent reaction: Difference between revisions
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Created page with "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..." |
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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. | The [[light|light]] dependent reaction is the first stage of [[photosynthesis|photosynthesis]]. The process begins when a [[chlorophyll|chlorophyll]] pigment in [[photosystem 2 (PS2)|photosystem 2 (PS2)]] in the [[thylakoid membrane|thylakoid membrane]] absorbs a [[photon|photon]] from light. This causes the PS2 to be in an unstable state which causes an [[electrons|electron]] to pass from PS2 to [[cytochrome b6f|cytochrome b6f]] to [[photosystem 1 (PS1)|photosystem 1 (PS1)]] in a series of [[Redox_reaction|redox reactions]] ([[Electron_transport_chain|electron transport chain]]) down the thylakoid membrane. Energy is lost at stages during the redox reaction, this energy is used to pump [[H+ ions|H<sup>+</sup> ions]] across the thylakoid membrane from the stroma creatining an [[electrochemical gradient|electrochemical gradient]]. H<sup>+</sup> [[ions|ions]] then flow back across membrane through [[ATP_synthase|ATP synthase]] which [[Catalyse|catalyses]] the reaction of [[ADP ribose|ADP]] and Pi to form [[ATP synthase|ATP]]. | ||
Latest revision as of 09:09, 26 November 2016
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.