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The CCHS Biology Department presentation over bacteria

The CCHS Biology Department presentation over bacteria

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Bacteria1 Bacteria1 Presentation Transcript

  • Bacteria
  • Bacterial History
    • The first cells in existence
    • Fossils exist for prokaryotes 3.5 billion years ago
    • Most bacteria autotrophic
    • Pathogenic bacteria make up only a small percentage of total bacterial species
  • Classification
    • Separated into two kingdoms based on rRNA sequencing
      • Archea/Archaebacteria
      • Bacteria/Eubacteria
    • Traditionally grouped by structure and physiology, and reaction to stains
  • Archeabacteria
    • Cell walls contain no peptidoglycan, do contain special lipids
    • First found in Extreme environments, but now found everywhere
  • Archeabacteria
    • Three Major Types
      • Methanogens- harvest energy by converting CO2 and H2 into methane gas
      • Extreme Halophiles- Salt loving bacteria, use the difference in concentration to generate ATP
      • Thermoacidophiles- Live in very hot very acidic places, like near underwater volcanic vents
  • Eubacteria
    • Have one of three major shapes
      • Cocci
      • Bacilli
      • Spirilla
  • Eubacteria- Gram Staining
    • Process designed to differentiate between cell wall types
    • Gram Positive
      • Purple
      • Thick peptidoglycan Layer
    • Gram Negative
      • Pink
      • Thin peptidoglycan layer
      • Double lipid membrane
  •