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Bacteria. Our invisible friends. Bacteria are prokaryotes. Pro – before Karyon – nucleus The simplest forms of life are prokaryotes. Earth’s first cells were prokaryotes. Lots of Them!. Prokaryotes are Earth’s most abundant life forms. They can survive in many environments.

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bacteria

Bacteria

Our invisible friends

bacteria are prokaryotes
Bacteria are prokaryotes
  • Pro – before
  • Karyon – nucleus
  • The simplest forms of life are prokaryotes.
  • Earth’s first cells were prokaryotes.
lots of them
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.
prokaryote review
Prokaryote Review
  • Mostly single-celled
  • No nucleus or organelles
  • Circular chromosomes
  • Cell walls
  • Reproduce mostly asexually
  • Anaerobic or aerobic
  • Heterotrophic or autotrophic
archaebacteria
Archaebacteria
  • Methane producers – anaerobic
  • Halophiles
    • Halo = salt
    • Philia = love
  • Thermophiles
    • Thermo = heat
eubacteria
Eubacteria
  • Parasitic heterotrophs (Streptococcus)
  • Saprophages
    • Sapro = death
    • Phage = eat
  • Cyanobacteria (blue-green algae)
    • Photosynthetic
  • Chemosynthetic autotrophs (Rhizobium)
bacteria are named by shape
Bacteria are Named by Shape
  • Cocci (ball-shaped)
    • Streptococcus mutans
  • Bacillus (rod-shaped)
    • Clostridium botulinum
  • Spirilli (spiral-shaped)
    • Treponema palladium
germ theory of disease
Germ Theory of Disease
  • Joseph Lister – Aseptic Techniques
  • Robert Koch – Germ Theory
    • A specific microorganism causes a specific disease
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