Bio%20201%20S12%20Lect%2013%20%28True%29%20v3

Leaf cross section mesophyll cell leaf

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Unformatted text preview: generaEon also associated with some PhotosyntheEc Bacteria – more complex photosynthesis probably evolved from this Mostly composed of Chlorophyll A in plants “Advanced” Light reacEons (cyanobacteria, chloroplasts of Plantae, other groups) •  electrons are used by PS II to split water, generaEng O2 Primary electron acceptor Primary electron acceptor Photons Energy for synthesis of PHOTOSYSTEM I PHOTOSYSTEM II by chemiosmosis photosystem I (1950s) was discovered before photosystem II (early 1960s) •  Two connected photosystems collect photons of light and transfer the energy to chlorophyll electrons •  The excited electrons are passed from the primary electron acceptor to electron transport chains –  Their energy ends up in ATP and NADPH •  The producEon of ATP by chemiosmosis in photosynthesis Thylakoid compartment (high H+) Light Light Thylakoid membrane Antenna molecules Stroma (low H+) ELECTRON TRANSPORT CHAIN PHOTOSYSTEM II PHOTOSYSTEM I ATP SYNTHASE Summary—Light Dependent ReacJons a. Overall input light energy, H2O b. Overall output ATP, NADPH, O2 Light Independent ReacJons = Calvin Cycle Carbon from CO2 is converted to glucose (ATP and NADPH drive the reducEon of CO2 to C6H12O6.) Rubisco = RibUlose BISphoshate Carboxylase/ Oxygenase - the most abundant protein in the world ~50% of leaf protein in C3 plants , ~30% of leaf protein in C4 plants Summary—Light Independent ReacJons a. Overall input CO2, ATP, NADPH. b. Overall output glucose...
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This note was uploaded on 10/02/2013 for the course BIO 201 taught by Professor True during the Spring '08 term at SUNY Stony Brook.

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