Two microorganisms, P and Q, look very similar. Scientists originally placed them in the same group.
The scientists compared a section of DNA from each microorganism with the corresponding DNA section in representative organisms from the three domains.
| Microorganism | Similarity to Bacteria (%) | Similarity to Archaea (%) | Similarity to Eukaryota (%) |
|---|---|---|---|
| P | 88 | 61 | 43 |
| Q | 58 | 90 | 45 |
Which domain should each microorganism be placed in, and why should the earlier classification be revised? Use the data in your answer.
81 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.