The Diversity of Life I. An Overview II. An Overview of 'The Bacteria'

1. The Diversity of Life I. An Overview II. An Overview of 'The Bacteria'

2. The Diversity of Life I. An Overview II. An Overview of 'The Bacteria'

3. The Diversity of Life I. An Overview II. An Overview of 'The Bacteria' The key thing about bacteria is their metabolic diversity. Although they didn't radiate much morphologically (spheres, rod, spirals), they DID radiate metabolically. As a group, they are the most metabolically diverse group of organisms.

4. The Diversity of Life I. An Overview II. An Overview of 'The Bacteria' The key thing about bacteria is their metabolic diversity. Although they didn't radiate much morphologically (spheres, rod, spirals), they DID radiate metabolically. As a group, they are the most metabolically diverse group of organisms. A. Oxygen Demand all eukaryotes require oxygen.

5. The Diversity of Life I. An Overview II. An Overview of 'The Bacteria' The key thing about bacteria is their metabolic diversity. Although they didn't radiate much morphologically (spheres, rod, spirals), they DID radiate metabolically. As a group, they are the most metabolically diverse group of organisms. A. Oxygen Demand all eukaryotes require oxygen. bacteria show greater variability: - obligate anaerobes - die in presence of O2 - aerotolerant - don't die, but don't use O2 - facultative aerobes - can use O2, but don't need it - obligate aerobes - require O2 to live

6. The Diversity of Life I. An Overview II. An Overview of 'The Bacteria' The key thing about bacteria is their metabolic diversity. Although they didn't radiate much morphologically (spheres, rod, spirals), they DID radiate metabolically. As a group, they are the most metabolically diverse group of organisms. A. Oxygen Demand all eukaryotes require oxygen. bacteria show greater variability: - obligate anaerobes - die in presence of O2 - aerotolerant - don't die, but don't use O2 - facultative aerobes - can use O2, but don't need it - obligate aerobes - require O2 to live represents an interesting continuum, perhaps correlating with the presence of O2 in the atmosphere.

7. The Diversity of Life I. An Overview II. An Overview of 'The Bacteria' The key thing about bacteria is their metabolic diversity. Although they didn't radiate much morphologically (spheres, rod, spirals), they DID radiate metabolically. As a group, they are the most metabolically diverse group of organisms. B. Nutritional Categories:

8. The Diversity of Life I. An Overview II. An Overview of 'The Bacteria' The key thing about bacteria is their metabolic diversity. Although they didn't radiate much morphologically (spheres, rod, spirals), they DID radiate metabolically. As a group, they are the most metabolically diverse group of organisms. B. Nutritional Categories: - chemolithotrophs: use inorganics (H2S, etc.) as electron donors for electron transport chains and use energy to fix carbon dioxide. Only done by bacteria.

9. The Diversity of Life I. An Overview II. An Overview of 'The Bacteria' The key thing about bacteria is their metabolic diversity. Although they didn't radiate much morphologically (spheres, rod, spirals), they DID radiate metabolically. As a group, they are the most metabolically diverse group of organisms. B. Nutritional Categories: - chemolithotrophs: use inorganics (H2S, etc.) as electron donors for electron transport chains and use energy to fix carbon dioxide. Only done by bacteria. - photoheterotrophs: use light as source of energy, but harvest organics from environment. Only done by bacteria.

10. The Diversity of Life I. An Overview II. An Overview of 'The Bacteria' The key thing about bacteria is their metabolic diversity. Although they didn't radiate much morphologically (spheres, rod, spirals), they DID radiate metabolically. As a group, they are the most metabolically diverse group of organisms. B. Nutritional Categories: - chemolithotrophs: use inorganics (H2S, etc.) as electron donors for electron transport chains and use energy to fix carbon dioxide. Only done by bacteria. - photoheterotrophs: use light as source of energy, but harvest organics from environment. Only done by bacteria. - photoautotrophs: use light as source of energy, and use this energy to fix carbon dioxide. bacteria and some eukaryotes.

11. The Diversity of Life I. An Overview II. An Overview of 'The Bacteria' The key thing about bacteria is their metabolic diversity. Although they didn't radiate much morphologically (spheres, rod, spirals), they DID radiate metabolically. As a group, they are the most metabolically diverse group of organisms. B. Nutritional Categories: - chemolithotrophs: use inorganics (H2S, etc.) as electron donors for electron transport chains and use energy to fix carbon dioxide. Only done by bacteria. - photoheterotrophs: use light as source of energy, but harvest organics from environment. Only done by bacteria. - photoautotrophs: use light as source of energy, and use this energy to fix carbon dioxide. bacteria and some eukaryotes. - chemoheterotrophs: get energy and carbon from organics they consume. bacteria and some eukaryotes.

12. The Diversity of Life I. An Overview II. An Overview of 'The Bacteria' The key thing about bacteria is their metabolic diversity. Although they didn't radiate much morphologically (spheres, rod, spirals), they DID radiate metabolically. As a group, they are the most metabolically diverse group of organisms. B. Nutritional Categories: - chemolithotrophs: use inorganics (H2S, etc.) as electron donors for electron transport chains and use energy to fix carbon dioxide. Only done by bacteria. - photoheterotrophs: use light as source of energy, but harvest organics from environment. Only done by bacteria. - photoautotrophs: use light as source of energy, and use this energy to fix carbon dioxide. bacteria and some eukaryotes. - chemoheterotrophs: get energy and carbon from organics they consume. bacteria and some eukaryotes.

13. The Diversity of Life I. An Overview II. An Overview of 'The Bacteria' The key thing about bacteria is their metabolic diversity. Although they didn't radiate much morphologically (spheres, rod, spirals), they DID radiate metabolically. As a group, they are the most metabolically diverse group of organisms. C. Their Ecological Importance

14. The Diversity of Life I. An Overview II. An Overview of 'The Bacteria' The key thing about bacteria is their metabolic diversity. Although they didn't radiate much morphologically (spheres, rod, spirals), they DID radiate metabolically. As a group, they are the most metabolically diverse group of organisms. C. Their Ecological Importance - major photosynthetic contributors (with protists and plants)

15. The Diversity of Life I. An Overview II. An Overview of 'The Bacteria' The key thing about bacteria is their metabolic diversity. Although they didn't radiate much morphologically (spheres, rod, spirals), they DID radiate metabolically. As a group, they are the most metabolically diverse group of organisms. C. Their Ecological Importance - major photosynthetic contributors (with protists and plants) - the only organisms that fix nitrogen into biologically useful forms that can be absorbed by plants.

16. The Diversity of Life I. An Overview II. An Overview of 'The Bacteria' The key thing about bacteria is their metabolic diversity. Although they didn't radiate much morphologically (spheres, rod, spirals), they DID radiate metabolically. As a group, they are the most metabolically diverse group of organisms. C. Their Ecological Importance - major photosynthetic contributors (with protists and plants) - the only organisms that fix nitrogen into biologically useful forms that can be absorbed by plants. - primary decomposers (with fungi)

17. The Diversity of Life I. An Overview II. An Overview of 'The Bacteria' The key thing about bacteria is their metabolic diversity. Although they didn't radiate much morphologically (spheres, rod, spirals), they DID radiate metabolically. As a group, they are the most metabolically diverse group of organisms. C. Their Ecological Importance - major photosynthetic contributors (with protists and plants) - the only organisms that fix nitrogen into biologically useful forms that can be absorbed by plants. - primary decomposers (with fungi) - pathogens

18. The Diversity of Life I. An Overview II. An Overview of 'The Bacteria' III. Domain Archaea and The Early Earth

19. The Diversity of Life I. An Overview II. An Overview of 'The Bacteria' III. Domain Archaea and The Early Earth The three Archaean groups exploit extreme environments (like early Earth?):

20. The Diversity of Life I. An Overview II. An Overview of 'The Bacteria' III. Domain Archaea and The Early Earth The two Archaean groups exploit extreme environments (like early Earth?): Crenarchaeota: 'thermacidophiles' - reduce sulphur compounds in geothermal sulphur springs and geothermal vents.

21. The Diversity of Life I. An Overview II. An Overview of 'The Bacteria' III. Domain Archaea and The Early Earth The two Archaean groups exploit extreme environments (like early Earth?): Crenarchaeota: 'thermacidophiles' - reduce sulphur compounds in geothermal sulphur springs and geothermal vents. Euryarchaeota: 'methanogens' - reduce CO2 and harvest small amounts of energy.

22. The Diversity of Life I. An Overview II. An Overview of 'The Bacteria' III. Domain Archaea and The Early Earth The two Archaean groups exploit extreme environments (like early Earth?): Crenarchaeota: 'thermacidophiles' - oxidize sulphur compounds in geothermal sulphur springs and geothermal vents. Euryarchaeota: 'methanogens' - reduce CO2 and harvest small amounts of energy. 'halophiles' - live in saline environments; some have a very primitive form of photosynthesis.