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GCSE Biology · key term
One of the three domains; it contains prokaryotic microorganisms that are genetically distinct from bacteria.
Used by Edexcel
Specification 4.7 · Paper 1
Revise: ClassificationArchaea — prokaryotic organisms that are genetically distinct from bacteria; some live in extreme environments, although this is not true of every archaeal species
When asked how genetic analysis changed classification, give the full chain: compare genetic sequences → identify similarities and differences → infer evolutionary relationships → separate Archaea from Bacteria → propose three domains.
Do not describe Archaea as simply another type of bacterium. Both Archaea and Bacteria are prokaryotic, but genetic evidence shows that they are distinct groups.
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