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Bacteria

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