A newly identified microorganism has cells without a nucleus. Scientists compared part of its DNA base sequence with sequences from organisms in three domains. The table shows the percentage of bases that differed.
| Domain used for comparison | Percentage of bases that differed |
|---|---|
| Bacteria | 2% |
| Archaea | 18% |
| Eukaryota | 25% |
Explain which domain the microorganism should be classified in and what the results show about using cell structure alone for classification.
85 exam-style questions on Edexcel GCSE Biology 4.1 Evolution and natural selection, covering 4.1.1 Work of Darwin and Wallace and 4.1.2 Resistant organisms and evolution. Each one has a worked solution and a mark scheme showing where the marks go.