311C L10OL - Photosynthesis The Process that Feed the...

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Photosynthesis: The Process that Feed the Biosphere
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Energy Flow & Chemical Cycling Light energy ECOSYSTEM CO 2 + H 2 O Photosynthesis in chloroplasts Cellular respiration in mitochondria Organic molecules + O 2 ATP powers most cellular work Heat energy Figure 9.2
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Photosynthesis: Overview Summary of photosynthesis: 6 CO 2 + 12 H 2 O + E C 6 H 12 O 6 + 6 O 2 + 6 H 2 O 6 CO 2 + 6 H 2 O + E C 6 H 12 O 6 + 6 O 2 CO 2 + H 2 O + E [CH 2 O] + O 2
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Photosynthesis: Overview Where does O 2 come from? C O 2 + 2 H 2 O CO 2 + 2 H 2 O
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Photosynthesis & Redox 6 CO 2 + 6 H 2 O C 6 H 12 O 6 + 6 O 2
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Photosynthesis: Overview Photosynthesis consists of two stages 1. Light reactions 2. Calvin cycle
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The Light Reactions Convert light energy to the chemical energy of NADPH and ATP Occurs in thylakoid membranes
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The Nature of Sunlight Travels in waves Particle-like behavior Photons = light particles with a fixed quantity of energy
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The electromagnetic spectrum
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Photosynthetic Pigments Absorb light that can be used to drive photosynthesis
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Photosynthetic Pigments Absorption spectra Chlorophyll a Chlorophyll b Carotenoids Accessory pigments
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