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Photosynthesis quiz

TermDefinition
H+ chemiosmosis ATP synthase pumps H+ back across membrane using nrg of H+ movement to generate ATP (exactly how it does in cell respiration) Chlorophyll absorbs electromagnetic nrg sunlight and converts into e- excitation
Photosystem II light absorbed by e- NRG transfered to plastoquinone (protein) E- replaced by H2O inside of thylakoid space -> yields O2 and h+
Calvin cycle 1) Carbon fixation CO2 + Rubisco (5-c sug) 2) Reduction ATP + NADPH consumed to prod G3P 3CO2 6ATP 6NADPH consumed 6G3P only 1 can exit cycle 3) Regenerate Rubsico 5 of 6 G3P recombine to generate rubisco, consumes 3ATP
Calvin cycle ATP and NADPH carbon fixation In stroma 3 CO2 + 9ATP + 6NADPH -> G3P Take 6 turns to produce glucose
Light reactions Thylakoids Sunlight present Electromagnetic nrg into chem energy (ATP and NADPH) H2O + photons of light -> ATP + NADPH + O2 Photons of light excite e- Red light absorbed best, green reflected
Calvin cycle Chloroplast stroma (fluid like cytoplasm) No sunlight required Uses NADPH and ATP to build sugars from CO2 (carbon fixation)
Light reactions Photosystem 2, Cytochrome B6F complex, Photosystem 1, H+ chemiosmosis
Photosystem I Absorb light, yield high energy e- e- + NADP+ -> NADPH e- lost replenished by photosystem 2, accepted from Cytochrome b6f complex
Cytochrome b6f complex E- transport chain Plastoquinone - e- acceptor, then transfers e- from Photosystem II to the cytochrome b6f complex Pumps H+ to thylakoid space
Difference between photosystem I and photosystem II Photosystem II (PSII) is the first to act, splitting water to release oxygen and providing electrons, while Photosystem I (PSI) uses these electrons, along with more light energy, to produce NADPH
 

 



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