Unformatted text preview: Light as energy source CO 2 for carbon All green plants, algae, and cyanobacteria use carbon dioxide and give off oxygen. Their pigment is chlorophyll and the process is called oxygenic photosynthesis. Other bacteria carry out a process of photosynthesis but use different pigments. A big difference is that they do not produce oxygen—anoxygenic photosynthesis. This group includes the green sulfur bacteria and the purple sulfur bacteria. Their pigments are called bacteriochlorophylls. PHOTOHETEROTROPHS Use light as a source of energy but must have organic compounds as their carbon source. They are also anoxygenic. Thus group includes the green nonsulfur bacteria and the purple nonsulfur bacteria....
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- Fall '09