Biology › Section K · Viruses and prokaryotes › Topic K.4

Prokaryotic diversity

Prokaryotes are the most abundant and most varied life on Earth, thriving everywhere from your gut to boiling springs — and their fossils are the oldest record of life itself.

In this topic

  • Two domains of endless variety
  • Woese and the three domains
  • Prokaryotes are everywhere
  • The oldest fossils: stromatolites
  • Early Earth and the origin of life
  • Extremophiles
  • Worked example: Reading the Dead Sea as a habitat
  • Hard to culture
  • Worked example: Applying Koch's postulates
  • Biofilms
  • Common mistakes to avoid
  • Key takeaways

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