Prokaryote means "before nucleus"
     
today includes: blue green algae & bacteria
     
primitive, simple, versatile, common unicellular 
     
most successful life form- 80% to 90% of total biomass of planet
     
2,500 different species known
Some characteristics
     
lack membrane bound organelles
     
genes without protein = "naked DNA" - no "chromosomes"
     little to no internal compartmentation
     size range - 0.1 to 10 µm diameter

Cocci (coccus)
      Spherical prokaryotes that ocur singly (cocci), or in pairs (diplococci), or
     in chains as shown here, and in clusters resembling grapes    (
staphlococci).
Bacilli (bacillus)
     
Rod-shaped, spore-forming, bacteria (genus Bacillus) often forming chains
     and including B. anthracis, the causative agent of
anthrax.