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The Role of Bacteria in Our World: Growth, Reproduction, and Importance

Explore the fascinating world of bacteria, from their rapid reproduction to their essential roles as decomposers and nitrogen fixers. Learn about different bacterial shapes, reproduction methods like binary fission and conjugation, and the significance of bacteria in various environments.

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The Role of Bacteria in Our World: Growth, Reproduction, and Importance

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  1. *Growth and Reproduction • *Some bacteria can divide every 20 minutes • If there were unlimited resources, 1 bacteria could grow into a mass 4000 times the mass of earth in just 48 hours!!!

  2. Bacteria What is the role of bacteria in our world? List everything you know

  3. Bacteria Are living: • Made up of cells • Have DNA • Grow and develop • Use energy • Homeostasis • Reproduction

  4. B SMART

  5. 1) Binary Fission • Binary Fission: • Asexual reproduction where organism replicates DNA and divides in half • Produces two identical daughter cells

  6. Reproduction Binary fission

  7. 2) Conjugation • Conjugation: (“bacterial sex”) • Sexual reproduction where organism exchange genetic information

  8. B SMART Come back!!!!!

  9. Shapes S Cocci Bacilla Spirilla

  10. Shapes S S S Streptococus Streptobacilla Streptospirilla S S S S S S S Staphlococus Staphlobacilla Staphlospirilla

  11. Some are BAD and make us ill

  12. Streptococcus Strep throat Pnemonia

  13. Tetanus (lock jaw) Affects nervous system E. coli Some in our intestines … others are pathogens that can cause kidney failure

  14. Bacteria Can be bad … but can be good intestines Feel better with?? decomposers antibiotics

  15. Importance of Bacteria

  16. Decomposers • Break down things into simpler materials and release into the soil • *Help breakdown sewage treatment water

  17. Nitrogen Fixers • Converting nitrogen gas into a form plants can use • Allows nitrogen to cycle through biosphere

  18. Other Uses • E. coli in our intestines • Make vitamins that we cannot make • Oil digestion

  19. Archaebacteria!

  20. Archaea • Lack peptidoglycan walls and have different membrane lipids than Eubacteria • DNA sequences are closer to Eukaryotes than Bacteria

  21. Extremophiles • Extremophiles: • Live in extreme environments!

  22. Halophilic: salt loving

  23. Thermophilic: heat loving

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