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

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Unformatted text preview: Photosynthesis: The Process that Feed the Biosphere 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 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 Photosynthesis: Overview • Where does O 2 come from? C O 2 + 2 H 2 O CO 2 + 2 H 2 O Photosynthesis & Redox 6 CO 2 + 6 H 2 O C 6 H 12 O 6 + 6 O 2 Photosynthesis: Overview • Photosynthesis consists of two stages 1. Light reactions 2. Calvin cycle The Light Reactions • Convert light energy to the chemical energy of NADPH and ATP • Occurs in thylakoid membranes The Nature of Sunlight • Travels in waves • Particle-like behavior – Photons = light particles with a fixed quantity of energy The electromagnetic spectrum Photosynthetic Pigments • Absorb light that can be used to drive photosynthesis Photosynthetic Pigments Absorption spectra • Chlorophyll a • Chlorophyll b • Carotenoids Accessory pigments •...
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This note was uploaded on 04/02/2012 for the course BIO 311C taught by Professor Satasivian during the Spring '08 term at University of Texas.

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

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