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chapter 10 - Light energy ECOSYSTEM Photosynthesis CO2 H2O...

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1 Photosynthesis CO 2 + H 2 O C 6 H 12 O 6 + water + O 2 C 6 H 12 O 6 + water + O 2 CO 2 + H 2 O Respiration ECOSYSTEM Light energy Photosynthesis in chloroplasts Cellular respiration in mitochondria Organic molecules + O 2 CO 2 + H 2 O ATP powers most cellular work Heat energy Photoautotrophs Æ transform light energy into chemical energy Plants Unicellular protist Multicellular algae Cyanobacteria Purple sulfur bacteria 10 μm 1.5 μm 40 μm = 500 million years ago Earliest animals ; diverse algae Earliest multicellular eukaryotes ? Earliest eukaryotes ears ago Accumulation of atmospheric O 2 from photosynthetic cyanobacteria Oldest known prokaryotic fossils Origin of life ? Formation of Earth Billions of ye Rough endoplasmic reticulum Smooth endoplasmic reticulum Ribosomes (small brown dots) Central vacuole Microfilaments Intermediate filaments CYTOSKELETON Nuclear envelope Nucleolus Chromatin NUCLEUS Centrosome Golgi apparatus In plant cells but not animal cells: Chloroplasts Central vacuole and tonoplast Cell wall Plasmodesmata Microtubules Chloroplast Plasmodesmata Wall of adjacent cell Cell wall Mitochondrion Peroxisome Plasma membrane Plant Eukaryotic Cell Photosynthesis takes place in chloroplasts Leaf cross section Vein Mesophyll Stomata CO 2 O 2 Mesophyll cell Chloroplast Remember REDOX? 5 μm Outer membrane Intermembrane space Inner membrane Thylakoid space Thylakoid Granum Stroma 1 μm Thylakoid membranes Stroma
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