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6.4 Classification of living organisms

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Question 27

Scientists used an early light microscope to classify two very small microorganisms by their appearance. Microorganism X was assigned to Bacteria and microorganism Y was assigned to Archaea.

The scientists then chemically analysed the same section of DNA from each microorganism and from organisms whose domains were already known. A higher percentage match indicates that organisms are more closely related.

MicroorganismPercentage match with a known protistPercentage match with a known true bacteriumPercentage match with a known archaeon
X945651
Y438964

Explain how and why the scientists should change the domain classifications of microorganisms X and Y.

[3]
Markscheme

6.4 Classification of living organisms Questions

  1. GCSE
  2. /Biology
  3. /6.4 Classification of living organisms

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.

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