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Lecture7 - Photosynthesis 6 CO2 12 H2O light C6H12O6 6 H2O...

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1 Photosynthesis 6 CO 2 + 12 H 2 O + light C 6 H 12 O 6 + 6 H 2 O + 6 O 2 Requirements: light, pigments, access to CO 2 “Light reactions” Light capture pigments absorption and action spectra pigment activation Photophosphorylation chemiosmotic ATP synthesis cyclic photophosphorylation noncyclic photophosphorylation “Dark reactions” Chloroplasts are photosynthetic organelles •thylakoid membranes are site of light reactions •stroma is site of dark reactions Three processes of photosynthesis: In thylakoids: 1) light capture 2) pigment regeneration In stroma: 3) “dark reactions” Goal of light reactions: Produce ATP and NADPH to provide energy and reducing power for building sugars Mechanism: uses potential energy from H+ gradient produced by capture of light energy •Light = form of electromagnetic energy •Units of light energy = photons •Energy content is inversely proportional to wavelength •High energy = ionizing radiation •Visible light (380-750 nm) can raise electron to higher energy level
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