plumiThe evolutionary race between pathogens and hosts: Edexcel International A Level Biology questions
Edexcel International A Level Biology past-paper questions on 6.3.5 The evolutionary race between pathogens and hosts, 2019–2025, with mark schemes and examiner’s reports where available.
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Q9(c)
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All 9 questions on The evolutionary race between pathogens and hosts, as a list
- June 2025, Unit 4, Q9(c) (4 marks): The types of rice plants most susceptible to infection with RYMV are those imported from Asia into Africa. Explain why rice plants from Africa are less suscepti
- January 2025, Unit 4, Q6(c) (2 marks): Explain why it is important that these new types of drugs are developed. (2)
- October 2024, Unit 4, Q7(b)(iii) (2 marks): Explain the importance of developing new antibiotics, such as albicidin. (2)
- January 2023, Unit 4, Q9(c)(i) (2 marks): The graph shows some of the results of this investigation. Uninfected, untreated macrophages Untreated macrophages infected with Mycobacterium tuberculosis Unin
- October 2022, Unit 4, Q7(a) (2 marks): Explain why the development of this drug is an example of an ‘evolutionary race’ between humans and this pathogen. (2)
- January 2022, Unit 4, Q4(c)(ii) (6 marks): Discuss how E. coli and λ phage could interact and develop in their evolutionary race for existence. Use all the information in this question to support your an
- January 2021, Unit 5, Q8(d) (3 marks): During the production of some vaccines, the virus is allowed to replicate in eggs (paragraph 13). Explain how a vaccine produced in this way may become less eff
- January 2021, Unit 5, Q8(f) (2 marks): Suggest why the stems of the different versions of haemagglutinin molecules are the same but the heads can be different (paragraph 15). (2)
- January 2020, Unit 4, Q5(d) (2 marks): The protein VP35 inhibits the production of interferon by host cells. Explain why the structure of the Ebola virus includes VP35. (2)
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