Lecture 6- photosynthesis 2

electrons are donated to ferredoxin which donates

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Unformatted text preview: mplex to photosystem I is linked by the mobile copper- containing protein plastocyanin - from photosystem !, electrons are donated to ferredoxin, which donates electrons to the enzyme NADP+ reductase, wchich is gound on the stromal side of the thylakoid membrane - enzymes reduce NADP+ to NADPH by using 2 electrons from electron transport and a proton from the surrounding aqueous - this is called linear electron transport using light (>ig 7.12 pg 148) - by converting p680 to p680*, the absorption of light energy produces a molecule that is easily oxidized by the electron transport chain and electron glow is spontaneous process from p680* to photosystem I - 2nd photon of light absorbed by photosystem I results in the formation of P700*, which is easily oxidized by the primary electron acceptor of photosystem I, before >inally the electron is donated to NADP+ - >low of electrons along the photosynthetic electron transport chain is coupled to ATP synthesis b the buildup of proton gradient - the proton gradient across the thylakoid membrane is derived from the three processes - >irst, protons are translocated into...
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