10.5.05 - October 5, 2005 photosynthesis 6CO2 + 6H20...

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photosynthesis 6CO2 + 6H20 C6H12O6 + 6O2 Irreversible Summary of Reactions Green plants make oxygen Green plants require sunlight Green plants make “fixed air” Green plants require water 19 th century explaination: light splits CO2, releasing O2 – WRONG! PURPLE SULFUR BACTERIA: CO2 + 2H2S (CH2O)n + H20 + 2S CO2 + H2O (CH2O)N + O2 Realized that these equations were similar, so water must give rise to oxygen Tests o Light Reactions: Oxygen-18 (normal 16) – resulting in splitting of water, requiring light o Dark Reactions: C14 Studies – fixation of carbon, produced even in the dark. o Must be two reactions! Photosynthesis in Evolution Cyanobacteria photosystem II. 2.7 BYA 2.4-2.2 BYA, atmosphere contained oxygen. Aerobic respiratioc Light Reactions Eneregy from sunlight used to genetate ATP, NADPH. Water is oxidized, releasing O2 Which wavelengths drive photosynthesis? – o Chlorophyll a&b – 680-700nm (red),
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10.5.05 - October 5, 2005 photosynthesis 6CO2 + 6H20...

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