Ch_11_Photosynthesis - PHOTOSYNTHESIS BIOL-003 A....

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PHOTOSYNTHESIS BIOL-003 Spring 2010 1 A. Introduction 1. Photosynthesis (P/S)—light energy transformed into chemical energy 2. Main limiting factor for P/S is CO 2 a. 0.3% of atmosphere is CO 2 b. 21% of atmosphere is O 2 (O 2 = waste product of P/S) 3. Eukaryotic organelle for P/S is chloroplast a. Outer covering = 2 membrane layers b. Stroma = material between chloroplast membrane and grana c. Grana = stacks of thylakoid sacs d. Function = transform light energy into chemical energy (carbohydrates and other organic molecules) B. Photosynthesis 1. Overview a. Light-dependent reactions Light absorbed Energy stored in ATP and NADPH b. Light-independent reactions AKA “dark” reactions Energy from ATP and NADPH used to make carbohydrates 2. In chloroplast are chlorophylls and other light-absorbing pigments arranged in clusters called photosystems a. PS I—P700 (absorbs light at 700 nm wavelength) b. PS II—P680 (absorbs light at 680 nm wavelength) 3. Electron transport chain in membrane of thylakoid sacs
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Ch_11_Photosynthesis - PHOTOSYNTHESIS BIOL-003 A....

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