Energy transferring reactions

Energy transferring reactions - Energytransferringreactions

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Energy transferring reactions The pigment molecules that capture energy from the sun are arranged in the thylakoid membranes  of the chloroplasts in structurally separate units called  photosystems . Hundreds of systems are  present in each thylakoid. Each photosystem has a light collecting array of 200–300 molecules, the  antenna complex , not unlike a satellite dish, which collects and focuses the photons into the  reaction center  where energy processing begins. The photons move from antenna molecule to  antenna molecule without an energy loss, a resonance energy transfer.  There are two kinds of photosystems,  Photosystem I (PsI)  and  Photosystem II (PsII) . In the  reaction center of PsI the light-absorbing pigment is a specialized chlorophyll  a  molecule that  absorbs red light of 700 nanometer wavelength most efficiently, hence the designation  P700 . PsII 
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This note was uploaded on 11/14/2011 for the course BIO 1421 taught by Professor Farr during the Fall '08 term at Texas State.

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