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CLASSIFICATION OF ORGANISMS Bacteria in Biofilm Figure 03.05b: Typical eukaryotic cell Figure 03.05a: A stylized bacterial cell Whittaker’s CLASSIFICATION - consists of Five kingdoms CARL WOESE’S CLASSIFICATION - The three domain system Woese’s 3 Domains of Classification Archaea TBL03_01: Comparison of prokaryotes and eukaryotes THE ENDOSYMBIONT THEORY –To explain the origin of mitochondria and chloroplasts in Eukaryotic cells Cyanobacteria The Cyanobacterium, Anabena, showing heterocyst for nitrogen fixing Fossil of an ancient cyanobacterium Archaea are found in hostile environments such as in depths of oceans to create abundant life there Hydrothermal vent community GIANT CLAMS IN HYDROTHERMAL DEPTHS GIANT TUBE WORMS IN THE OCEAN DEPTHS WHERE THE EARTH’S CRUST HAS CRACKED Prokaryotes in hot spring in Yellowstone National Park Purple sulfur bacteria in sulfur springs- sulfur granules in cells Acid drainage from mine. Sulfur oxidizing Archaea use metal oxides and give off sulfuric acid Sulfur hot springs in Yellowstone National Park contain Archaea Red pigmented halophiles (Archaea) in high salt environment Oil spill cleanup using oil-digesting bacteria Figure 03.MF05: Three cells of Thiomargarita namibiensis, the largest bacterium ever found Courtesy of Heide Schulz, Max Planck Institute of Marine Microbiology, Germany Incredible discoveries of giant and nanosized bacteria
