BIOL110s05-14

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Unformatted text preview: s – Light Reactions (Light energy chemical E) chemical – Dark Reactions (Use E Fix Carbon!!) Fix 1 Linked Processes Photosynthesis • Energy-storing pathway (endergonic) • Releases oxygen (O2) • Requires carbon dioxide (CO2) Aerobic Respiration • Energy-releasing pathway (exergonic) • Requires oxygen • Releases carbon dioxide I. Chloroplasts Organelle of photosynthesis in plants and algae (protista) (protista) PS rxns occur in the PS thylakoid stacks (grana) thylakoid Photosynthesis Equation LIGHT ENERGY 12H2O + 6CO2 water carbon dioxide 6O2 + C2H12O6 + 6H2O oxygen glucose water Respiration 2 Two Stages of Photosynthesis sunlight H2O energy (water) CO2 (carbon dioxide) ATP lightlightdependent reactions ADP + Pi NADPH NADP+ glucose lightlightindependent reactions Suc, Starch, Cellulose Suc, O2 H2O (metabolic water) Variety of Pigments (light-absorbing molecules) (light- 1. 2. 3. 4. Chlorophylls a and b Carotenoids Anthocyanins Phycobilins Mg++ Chlorophylls Main pigments in most photoautotrophs Wavelength absorption (%) chlorophyll a chlorophyll b Wavelength (nanometers) Lipids!! – Tails in membrane bilayer High energy Low Energy Low 3 Pigme...
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This document was uploaded on 03/18/2010.

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