What makes Archaea Different?

  • Cell walls contain diff polysaccharides, not peptidoglycans, cellulose, or chitin
  • Plasma membrane contain different phospholipids

What Makes Archaea Similar

  • Like bacteria, are prokaryotes
  • Like eukaryotes, are not inhibited by antibiotics and some have introns
    • Bacteria don’t have ribosomes & ribosome activity is inhibited by antibiotics


  • Thrive in extreme conditions
  • Halophiles: highly saline
  • Thermophiles: very hot

Domain Eukarya

  • Evidence for common ancestry of eukaryotes
    • Organelles, linear chromosomes, histone proteins