Chapter 27

Prokaryotic Diversity

• Prokaryotes dated at 3.5 billion years old
• Modern Prokaryotes  are most abundant, lacking sexual reproduction

Domain Bacteria

• Proteobacteria
  • "true bacteria"
• Cyanobacteria
  • "Blue-Green bacteria"

Domain Archaea

• Have and "almost" nucleus
• specialized membranes
• surrounded by a cell wall
• old, can live in extreme conditions

Eukaryotic Diversity

• Kingdom Protista
  • Earliest eukaryotes in fossil record
  • most are microscopic and found in moist environments
  • DNA many separate groups
  • Most artificial category
    • "catchall" category