CLASSIFICATION OF ORGANISMS. Bacteria in Biofilm

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