Prokaryotic Cells

Prokaryotic Cell Shapes

Bacillus

Coccus

Spirillus

Prokaryotic Nucleoid: Prokaryotic “Chromosome”(and Plasmids)

Prokaryotic Cell Division:

“Binary Fission”

Gut Bacteria: Escherischia coli

Gut Bacteria: Lactobacillus acidophilus

Lactose (Milk Sugar) Lactic Acid

Fermentation

Gut Bacteria: “Ruminants”

“Rumen”

Pathogenic Bacteria: Bacillus anthracis

Streptococcus pyogenes

Pathogenic Bacteria: Streptococcus pyogenes

Borrelia burgdorferi

Pathogentic Bacteria: Borrelia burgdorferi

Pathogenic Bacteria: “STD’s”

Syphillus

Gonorrhoea

Chlamydia

Pathogenic Bacteria: Xanthomonas

Photosynthesizers: Anabaena(Cyanobacteria)

Light Energy

Chemical Energy

Chemosynthesizers

Tube Worms

Symbiotic Bacteria

Deep Sea Vent

Decomposers

Nitrogen Fixers: Rhizobium

Nitrogen Fixation: N2 NH4+

Alfalfa

Nitrogen Recyclers: Nitrosomonas, Nitrobacter

NH4+ NO2

- NO3-

Ammonium Nitrite Nitrate

Extreme Thermophiles

Extreme Halophiles

Methanogens

• Survive in Anaerobic Conditions• Many Use C02 (NOT O2) as an Electron Acceptor in Respiration• Produce Methane (CH4) as a Byproduct

Three Domains of Life:Eubacteria, Archaea, Eukarya

(Eubacteria, Archaea are Prokaryotic)

Prokaryotic Cells: Oldest Life in Fossil Record

3.5-3.6 Billion Years Old4.6 Billion Years Old

Putative Origin of Mitochondrion and Chloroplast

Cyanobacterium

Purple Non-Sulphur Bacterium