Lecture 11 Feb 16

Lecture 11 Feb 16 - 17:36 Light reactions (occur in...

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Unformatted text preview: 17:36 Light reactions (occur in thylakoid...not sure) Photosystem II (PS II) Light hits a chlorophyll molecule, and then bounces around to other pigments, which transfer the energy to P680 (absorbs at 680 nm). P680 also takes 2 electrons from water (oxygen is left as a waste product) Electron is excited and taken up by a primary electron acceptor, and then goes down an electron chain, which generates ATP Pq Cytochrome complex Pc P700 Photosystem I (PS I) P700 gets light energy from other chlorophyll molecules which have absorbed a photon of light Electron is excited and taken up by another primary electron acceptor Goes down a shorter electron transport chain Fd NADP + reductase NADP + + 2H + NADPH + H + PSI cannot proceed without the electrons coming from PS II Regulatory steps in the light reactions Cyclic photophosphorylation Electron in PS I goes to primary acceptor and then goes back to Fd in the first electron transport chain after PS II, then to cytochrome complex, then to Pc, and finally, back to P700.chain after PS II, then to cytochrome complex, then to Pc, and finally, back to P700....
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This note was uploaded on 03/14/2012 for the course BISC 13141 taught by Professor Williammcclure during the Spring '10 term at USC.

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Lecture 11 Feb 16 - 17:36 Light reactions (occur in...

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