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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