plumiNew evidence and the three-domain system: Edexcel International A Level Biology questions
Edexcel International A Level Biology past-paper questions on 4.4.2 New evidence and the three-domain system, 2019–2025, with mark schemes and examiner’s reports where available.
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Q2(a)
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All 20 questions on New evidence and the three-domain system, as a list
- June 2025, AS Unit 2, Q2(a) (1 mark): Which domains contain prokaryotic organisms? 1. Archaea 2. Bacteria 3. Eukarya (1) A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3
- June 2025, AS Unit 2, Q8(c)(i) (2 marks): Explain how scientists could have determined that E. viridis was more closely related to E. lucunter than to E. vanbrunti. (2)
- January 2025, AS Unit 2, Q6(b)(ii) (2 marks): Explain how scientists could determine how closely related I. plenipes is to I. tobini. (2)
- October 2024, AS Unit 2, Q2(a)(i) (1 mark): State the domain which contains diatoms. (1)
- October 2024, AS Unit 2, Q8(a) (2 marks): A scientist suggested that the Akhal-Teke breed is the same as an older breed known as the Turkoman horse. Describe one piece of information that would need to
- June 2024, AS Unit 2, Q1(b)(iv) (1 mark): Organisms can be classified into three domains. State which of the three domains would contain an organism with the organelles X and Y. (1)
- January 2024, AS Unit 2, Q8(a)(iii) (2 marks): Explain how molecular evidence could be used to determine which of the other five fox populations is the most closely related to the fox population on Santa Cru
- October 2023, AS Unit 2, Q4(a)(i) (1 mark): Both of these are found in the domain Bacteria. Give the names of the other two domains. (1) 1 2
- January 2023, AS Unit 2, Q3(a) (1 mark): Name the domain which would contain this organism. (1)
- January 2023, AS Unit 2, Q5(a) (2 marks): Describe how scientists could determine that this was a new type of bacteria. (2)
- October 2022, AS Unit 2, Q1(a) (1 mark): How many of the domains contain prokaryotic organisms? (1) A none B one C two D three
- January 2022, AS Unit 2, Q1(c) (4 marks): The other domains in the three‑domain system are Archaea and Bacteria. Complete the table to show in which of the domains the following structures would be foun
- October 2021, AS Unit 2, Q3(a)(i) (1 mark): Give one example of the molecular evidence used to support the three‑domain system. (1)
- October 2021, AS Unit 2, Q3(a)(ii) (2 marks): Describe the role of the scientific community in evaluating the evidence for this system of classification. (2)
- October 2021, AS Unit 2, Q3(b) (4 marks): The table shows some features of living organisms. Which box in each row shows whether the feature is found in these domains? (4) Archaea and Archaea and Archae
- June 2021, AS Unit 2, Q2(b)(i) (2 marks): Describe the information the scientists would have used to classify M. smithii into the Archaea domain. (2)
- June 2021, AS Unit 2, Q2(b)(ii) (3 marks): Scientists have identified a similar microorganism in the human mouth. This microorganism is called Methanobrevibacter oralis (M. oralis). Explain how the scien
- January 2020, AS Unit 2, Q5(a)(ii) (1 mark): State the domain in which this kingfisher is classified. (1)
- January 2020, AS Unit 2, Q5(b)(i) (2 marks): Using the proposed reclassification, explain which species of kingfisher are most closely related to Ceyx madagascariensis. (2)
- January 2020, AS Unit 2, Q5(b)(ii) (6 marks): Explain how molecular evidence led to the reclassification of species and how the scientific community would have reviewed the evidence before it was accepted.
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