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Exploring Our Invisible Friends: The World of Bacteria

Delve into the realm of prokaryotes, Earth's ancient and diverse life forms. Learn about Archaebacteria and Eubacteria, their shapes, and roles in nature. Get insights into the Germ Theory of Disease and key discoveries in microbiology history.

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Exploring Our Invisible Friends: The World of Bacteria

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  1. Bacteria Our invisible friends

  2. Bacteria are prokaryotes • Pro – before • Karyon – nucleus • The simplest forms of life are prokaryotes. • Earth’s first cells were prokaryotes.

  3. Lots of Them! • Prokaryotes are Earth’s most abundant life forms. • They can survive in many environments. • They can get energy from many different sources.

  4. Prokaryote Review • Mostly single-celled • No nucleus or organelles • Circular chromosomes • Cell walls • Reproduce mostly asexually • Anaerobic or aerobic • Heterotrophic or autotrophic

  5. Archaebacteria • Methane producers – anaerobic • Halophiles • Halo = salt • Philia = love • Thermophiles • Thermo = heat

  6. Eubacteria • Parasitic heterotrophs (Streptococcus) • Saprophages • Sapro = death • Phage = eat • Cyanobacteria (blue-green algae) • Photosynthetic • Chemosynthetic autotrophs (Rhizobium)

  7. Bacteria are Named by Shape • Cocci (ball-shaped) • Streptococcus mutans • Bacillus (rod-shaped) • Clostridium botulinum • Spirilli (spiral-shaped) • Treponema palladium

  8. Germ Theory of Disease • Joseph Lister – Aseptic Techniques • Robert Koch – Germ Theory • A specific microorganism causes a specific disease

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