Figure shows diagrams of single cells taken from four organisms, P, Q, R and S.
Figure: Cells taken from four different organisms

Give the letter of the organism that belongs to the domain Archaea or the domain Bacteria. Give a reason for your answer.
Organisms Q, R and S all belong to the domain Eukaryota. Give the feature shown in Figure 1 that places all three organisms in this domain.
Suggest which kingdom organism Q belongs to. Give a reason for your answer.
Explain why the invention of the electron microscope changed the way in which organisms such as P are classified.
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.