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 Thermophiles
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

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