plumiOne gene, more than one protein: Edexcel International A Level Biology questions
Edexcel International A Level Biology past-paper questions on 3.5.3 One gene, more than one protein, 2019–2025, with mark schemes and examiner’s reports where available.
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Q6(b)
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All 9 questions on One gene, more than one protein, as a list
- June 2025, AS Unit 2, Q6(b) (4 marks): One gene from this starfish pluripotent stem cell produces pre‑mRNA. The diagram shows how three different strands of active mRNA are produced from one strand o
- January 2025, AS Unit 2, Q7(a) (3 marks): Molecules of pre‑mRNA are produced by transcription of active genes. These molecules undergo post‑transcriptional changes to form active mRNA. Describe how post
- June 2024, AS Unit 2, Q5(b) (4 marks): The development of an embryo into either a female or a male fruit fly is determined by two different proteins. The female specific Dsx-F protein leads to the de
- June 2023, AS Unit 2, Q2(c) (3 marks): One gene can give rise to more than one type of protein through post‑transcriptional changes to the mRNA. One of these changes is the removal of introns. Explai
- June 2023, Unit 5, Q7(b) (4 marks): There are 14 different serotonin receptors found in the human nervous system. Three different genes are used to produce these receptors. Explain how three genes
- January 2023, AS Unit 2, Q8(b) (2 marks): One treatment for AD is mRNA therapy. In this therapy, people are given the mRNA molecules needed for arginase production. The mRNA used in this therapy is acti
- January 2022, AS Unit 2, Q3(b) (4 marks): Active mRNA is formed after post‑transcriptional modification of pre‑mRNA. The structure of pre‑mRNA produced from transcription is different from the structure
- October 2021, Unit 5, Q6(e) (3 marks): CD45 is a protein found on the surface of lymphocytes. Different forms of the CD45 protein are found on the surface of different lymphocytes. Describe how diffe
- October 2020, AS Unit 2, Q7(c) (5 marks): More than one type of protein can be synthesised from the RNA produced from one gene. The diagram shows parts of this process. DNA P Q R S T U V W X pre-mRNA P
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