Photosynthesis Review.docx - Photosynthesis the process by which light energy is converted to chemical bond energy and carbon is fixed into organic

Photosynthesis Review.docx - Photosynthesis the process by...

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Photosynthesis the process by which light energy is converted to chemical bond energy and carbon is fixed into organic compounds, two main processes: light- dependent and light-independent Light-Dependent Reactions use light directly to produce ATP that powers the light independent reactions Light-Independent Reactions consist of the Calvin cycle, which produces sugar, uses ATP formed during the light reactions Photosynthesis Formula 6 CO2 + 12 H2O -> C6H12O6 + 6 H2O + 6 O2 Photosynthetic Pigments absorb light energy and use it to provide energy to carry out photosynthesis, chlorophylls and carotenoids Chlorophyll a/b green, absorb all wavelengths of light in the red, blue, and violet range Carotenoids yellow, orange, and red, absorb light in the blue, green, and violet range Xanthophyll carotenoid with a slight chemical variation Phycobilins pigments found in red algae, reddish and absorb light in blue and green range Action Spectrum graph showing rate of photosynthesis at different wavelengths of light, obtained from a living plant Chlorophyll a the pigment that participates directly in the light reactions of photosynthesis, large molecule with
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a single magnesium atom in the head surrounding by alternating single and double bonds, double bonds are source of electrons that flow through the ETC during photosynthesis Chloroplast contains photosynthetic pigments that carry out photosynthesis Stroma where the light-independent reactions occur Photosystems light-harvesting complexes in the thylakoid membranes of chloroplasts, few hundred in each thylakoid, consists of reaction center containing chlorophyll a and several hundred antenna pigment moluecules PSII happens first, discovered second, absorbs light best in 680 nm range, called P680 PSI happens second, discovered first, absorbs light best in 700 nm range, called P700 Photosystem II energy is absorbed by P680, electrons from double bonds become energized, move into higher energy levels, captured by primary electron acceptor Photolysis water gets split apart, providing electrons to provide those lost from chlorophyll a, splits water
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