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Bacteria

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Bacteria

  1. 1. Bacteria Click here for Bacteria music video Click here for info on cell phone bacteria
  2. 2. Size of Bacteria <ul><li>Average bacteria 0.5 - 2.0 um in diam. </li></ul><ul><ul><li>RBC is 7.5 um in diam. </li></ul></ul><ul><li>Surface Area to Volume is 3:1 </li></ul><ul><li>Typical Eukaryote Cell SA/Vol is 0.3:1 </li></ul><ul><li>Food enters through SA, quickly reaches all parts of bacteria </li></ul><ul><li>Eukaroytes need structures & organelles </li></ul>Chapter 5 - The Microbial World
  3. 3. Shapes of Bacteria <ul><li>Coccus </li></ul><ul><ul><li>Chain = Streptoccus </li></ul></ul><ul><ul><li>Cluster = Staphylococcus </li></ul></ul><ul><li>Bacillus </li></ul><ul><ul><li>Chain = Streptobacillus </li></ul></ul><ul><li>Coccobacillus </li></ul><ul><li>Vibrio = curved </li></ul><ul><li>Spirillum </li></ul><ul><li>Spirochete </li></ul>Chapter 5 - The Microbial World
  4. 4. Chapter 5 - The Microbial World
  5. 5. Chapter 5 - The Microbial World
  6. 6. Chapter 5 - The Microbial World
  7. 7. Bacterial Structures <ul><li>Flagella </li></ul><ul><li>Pili </li></ul><ul><li>Capsule </li></ul><ul><li>Plasma Membrane </li></ul><ul><li>Cytoplasm </li></ul><ul><li>Cell Wall </li></ul><ul><li>Spores </li></ul>Chapter 5 - The Microbial World
  8. 8. Chapter 5 - The Microbial World Eukaryote Cell Structure
  9. 9. Flagella <ul><li>Motility - movement </li></ul><ul><li>Swarming occurs with some bacteria </li></ul>Chapter 5 - The Microbial World
  10. 10. Chapter 5 - The Microbial World
  11. 11. Bacteria <ul><li>Their cytoplasm is 80% Water </li></ul><ul><li>DNA is circular, Haploid (1N) </li></ul><ul><ul><li>Advantages of 1N DNA over 2N DNA </li></ul></ul><ul><ul><ul><li>More efficient; grows quicker </li></ul></ul></ul><ul><ul><ul><li>Mutations allow adaptation to environment quicker </li></ul></ul></ul><ul><li>Plasmids; extra circular DNA </li></ul><ul><ul><li>Antibiotic Resistance </li></ul></ul><ul><li>No organelles (Mitochondria, Golgi, etc.) </li></ul>Chapter 5 - The Microbial World
  12. 12. Endospores <ul><li>Resistant structure </li></ul><ul><ul><li>Heat, irradiation, cold </li></ul></ul><ul><ul><li>Boiling >1 hr still viable </li></ul></ul><ul><li>Takes time and energy to make spores </li></ul><ul><li>Bacillus anthracis - spores </li></ul><ul><ul><li>Used in biological warfare </li></ul></ul>Chapter 5 - The Microbial World
  13. 13. Chapter 5 - The Microbial World
  14. 14. Bacteria <ul><li>“ Extreme” Bacteria – Domain of Archae </li></ul><ul><ul><li>Live near hydrothermal vents 250F, sulfur springs, saline lakes, acid locations. </li></ul></ul><ul><ul><li>Extremophiles = “lover of extremes” </li></ul></ul><ul><ul><li>Chemosynthesis not photosynthesis </li></ul></ul><ul><ul><li>Use Sulfate or Methane as energy source to make “food” for themselves since they are autotrophs (self feeders) </li></ul></ul>Chapter 5 - The Microbial World
  15. 15. Chapter 5 - The Microbial World
  16. 16. Chapter 5 - The Microbial World
  17. 17. Chapter 5 - The Microbial World
  18. 18. Chapter 5 - The Microbial World
  19. 19. Binomial nomenclature: Genus & Species

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