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Lesson: Chapter 13 — The Living World

13.1. The three domains 2 of 5

Archaea — life at the extremes

The organisms of Domain Archaea are prokaryotic — they have no organised nucleus.

Where they live

They are organisms able to live in extreme environments — places no other organism could tolerate at all.

Volcanoes Deserts Ice fields Hot springs Ocean floor Salt flats

Not sensitive to antibiotics

Not being sensitive to most antibiotics, they cannot be destroyed by antibiotics. This is the chief thing separating them from the bacteria of the next page.

Examples

  • Methanogens
  • Halophiles

Both names say what they do: methanogens generate methane, and halophiles are lovers of salt.