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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
    •