Scientists investigate three microorganisms.
| Organism | Nucleus | Habitat | Chemical analysis |
|---|---|---|---|
| X | Absent | Hot spring | Matches reference organisms in Archaea |
| Y | Absent | Cool lake | Not yet completed |
| Z | Present | Hot spring | Not yet completed |
Scientists have not yet assigned Y to a domain. Consider every assignment consistent with the evidence.
What is the minimum and maximum number of domains represented, and what can be concluded about Y?
Minimum 2, maximum 3; Y could belong to Archaea or Bacteria.
Minimum 2, maximum 3; Y could belong to Bacteria or Eukaryota.
Minimum 3, maximum 3; Y could belong to Archaea or Bacteria.
Minimum 2, maximum 2; Y could belong to Bacteria or Eukaryota.
40 exam-style questions on AQA GCSE Biology 6.4 Classification of living organisms, covering 6.4 Classification of living organisms. Each one has a worked solution and a mark scheme showing where the marks go.