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Classification of Bacteria

Classification of Bacteria - oxygen released into the early...

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Classification of Bacteria Bacteria are classified on the basis of their method of energy acquisition. Traditional classifications include chemosynthetic, photosynthetic, and heterotrophic groups. Molecular and cladistic studies are reshaping these traditional groups. In the absence of a consensus the traditional groups are employed here. . Chemosynthetic Bacteria Chemosynthetic bacteria are autotrophic , and obtain energy from the oxidation of inorganic compounds such as ammonia, nitrite (to nitrate), or sulfur (to sulfate). Photosynthetic Bacteria Photosynthetic bacteria carry out conversion of sunlight energy into carbohydrate energy. Cyanobacteria, an example of which is shown in Figure 13, are the major group of photosynthetic bacteria. Some early cyanobacteria may have formed the
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Unformatted text preview: oxygen released into the early atmosphere, transforming our planet from one with an oxygen-free atmosphere, to the modern one that has a significant amount of oxygen present. . In addition to chlorophyll a , cyanobacteria also have the blue pigment phycocyanin and the red pigment phycoerythrin . Eukaryotic autotrophs all have chloroplasts in which the photosynthetic process occurs. The typical chloroplast organization has thylakoids surrounded by a fluid-like stroma. The chloroplast is a membrane bound organelle. Prokaryotes by definition lack such structures. How can bacteria carry out photosynthesis? The answer is shown in Figure 14. By infolding their cell membrane, prokaryotic autotrophs form thylakoids, in effect turning the bacterium into a single chloroplast....
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