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