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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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