Photosynthesis and Fermentation

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Unformatted text preview: Download 6 Download 6 Photosynthesis * Fermentation Principles of Biology BIOL 1543 Greig Roberts, DDS Office: SCEN 417 E-Mail: [email protected] 2 The fuel for respiration ultimately comes from photosynthesis • All organisms can harvest energy from organic molecules. • Plants can make these molecules from inorganic sources by the process of photosynthesis. 3 Life’s energy cycle Photosynthesis and cellular respiration provide energy for life . • Cellular respiration makes ATP and consumes O 2 during the conversion of glucose to CO 2 and H 2 O. • Photosynthesis uses solar energy to produce glucose and O 2 from CO 2 and H 2 O. CO 2 H 2 O Glucose O 2 ATP ECOSYSTEM Sunlight energy Photosynthesis in chloroplasts Cellular respiration in mitochondria (for cellular work) Heat energy + + 4 Light energy PHOTOSYNTHESIS CO 2 + H 2 O Carbon dioxide Water C 6 H 12 O 6 + O 2 Glucose Oxygen gas Photosynthesis Photosynthesis is the process by which certain organisms use light energy to make sugar and oxygen gas from carbon dioxide and water. 5 Life’s energy producers Autotrophs are the “producers” of the biosphere. • Autotrophs produce their own food and sustain themselves without eating other organisms. • Plants, algae, and some bacteria are photoautotrophs . • Photoautotrophs produce food consumed by virtually all organisms. 6 Leaf Cross Section Leaf Mesophyll Cell Mesophyll Stoma CO 2 O 2 Chloroplast Chloroplast Granum Thylakoid Outer membrane Inner membrane Photosynthesis occurs in chloroplasts In plants, photosynthesis occurs primarily in chloroplasts in the leaves. The chloroplasts contain stroma and stacks of thylakoids called grana . 7 Chloroplast Granum Thylakoid Thylakoid space Outer membrane Inner membrane Photosynthesis occurs in chloroplasts Intermembrane space Stroma 8 Plants produce O2 gas by splitting water The O 2 produced by photosynthesis is made from the oxygen atoms in water. 9 Photosynthesis occurs in two stages...
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This note was uploaded on 10/14/2011 for the course BIOL 1543 taught by Professor Roberts during the Spring '08 term at Arkansas.

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