Photosynthesis

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BILD1 5/1/08 Photosynthesis
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Preview Chloroplast Light receptor Photosystems Light reaction Non-cyclic Cyclic ETC + chemiosmosis Calvin cycle Alternative systems C3 C4 CAM
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g light energy to build macromolecules e formation of macromolecules and organic molecules quires energy; G > 0 Nonspontaneous TEROTROPHS: Obtain organic material by consumption. TOTROPHS: “Self-feeders”; produce organic material ing CO 2 and environmental materials. Plants = PHOTOAUTOTROPHS. Use: 1) Light 2) CO 2 To make sugars 3) H 2 0
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Photoautotrophs Plants, on land Multicellular algae, in water Unicellular protist Cyanobacteria, the prokaryotes Purple sulfur bacteria These organisms use light energy to drive the synthesis of organic molecules from carbon dioxide and water. They feed not only themselves, but the entire living world.
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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 Energy flow and chemical recycling in ecosystems
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OTOSYNTHESIS ombination of two distinct processes: PHOTO = harvesting of light energy --> Light Reactions SYNTHESIS = Using E to build sugar --> Calvin Cycle Respiration in Reverse”: 6CO 2 + 6H 2 O + Light E -----> C 6 H 12 O 6 + 6O 2
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The location of photosynthesis in a plant Mesophyll cell Leaf Vein Stomata CO 2 O 2 Chloroplast Outer membrane Intermembrane space Inner membrane Thylakoid (lipid bilayer) Thylakoid Space Granum Stroma Leaf cross section
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Another view of a chloroplast
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An overview of photosynthesis: cooperation of the light reactions and the Calvin cycle Light LIGHT REACTIONS Chloroplast H 2 O
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ATP NADPH O 2 H 2 O Light LIGHT REACTIONS Chloroplast An overview of photosynthesis: cooperation of the light reactions and the Calvin cycle
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CO 2 CALVIN CYCLE O 2 [CH 2 O] (sugar) NADP + ADP + P i H 2 O Light LIGHT REACTIONS Chloroplast ATP NADPH An overview of photosynthesis: cooperation of the light reactions and the Calvin cycle
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Photosynthesis Light reactions Capture energy from sunlight and excite electrons Replenish electrons • H 2 O is used; O 2 is released Produce ATP Electron transport chain
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This note was uploaded on 09/27/2008 for the course BILD 1 taught by Professor Boulanger during the Spring '08 term at UCSD.

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Photosynthesis - BILD1 5/1/08 Photosynthesis Preview...

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