METABOLIC DIVERSITY - Light as energy source CO 2 for...

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METABOLIC DIVERSITY An organism’s metabolic pathways depend on the enzymes available. All organisms can be  classified according to their nutritional pattern: 1. Source of energy 2. Source of carbon 1. ENERGY SOURCE a. Phototrophs—can use light energy b. Chemotrophs—must obtain energy from oxidation-reduction of chemical compounds 2. CARBON SOURCE a. Autotrophs—can draw carbon from carbon dioxide b. Heterotrophs—carbon from organic compounds These requirements can be combined: 1. Photoautotrophs—light energy, carbon from CO 2 2. Photoheterotrophs—light energy, carbon from organic compounds 3. Chemoautotrophs—energy from chemical compounds, carbon from CO 2 4. Chemoheterotrophs—energy from chemical compounds, carbon from organic  compounds   PHOTOAUTOTROPHS
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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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