plumiRegulating gene expression: OCR A‑Level Biology A questions
OCR A-Level Biology A past-paper questions on 6.1.1.2 Regulating gene expression, 2016–2025, with mark schemes and examiner’s reports where available.
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Q4(b)
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Open the full PDFYour answerQ16(c)(i)
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Open the full PDFQ1(c)(iii)
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Open the full PDFQ20(b)(iii)
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All 7 questions on Regulating gene expression, as a list
- June 2025, Paper 3, Q4(b) (2 marks): Outline how gene expression is regulated within cells at the post‑transcriptional level. [2]
- June 2024, Paper 2, Q7 (1 mark): Which of the statements describe(s) control of gene expression at the post-transcriptional level? 1 binding of a repressor protein to an operator sequence 2 the
- June 2023, Paper 2, Q7 (1 mark): Lactose metabolism in E. coli is controlled by the lac operon. Which of the structures associated with the lac operon contain nucleic acids? 1: the operator 2:
- November 2021, Paper 2, Q4 (1 mark): Genes are not expressed during cell division because chromosomes are more tightly wound around histone proteins than during interphase. Which of the following s
- November 2021, Paper 2, Q16(c)(i) (2 marks): Explain why some regions of DNA can be described as ‘non-coding’. [2]
- June 2018, Paper 3, Q1(c)(iii) (2 marks): Suggest how allele B inhibits the expression of allele A. [2]
- June 2017, Paper 2, Q20(b)(iii) (2 marks): In order for lactose to enter the cytoplasm of E. coli a protein is required. The E. coli living in the digestive system of young mammals are more likely to con
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