plumiProkaryotic and eukaryotic cells: OCR A‑Level Biology A questions
OCR A-Level Biology A past-paper questions on 2.1.1.6 Prokaryotic and eukaryotic cells, 2016–2025, with mark schemes and examiner’s reports where available.
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Q22(b)(i)
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All 15 questions on Prokaryotic and eukaryotic cells, as a list
- June 2025, AS Paper 1, Q22(b)(i) (1 mark): The DNA in the nucleus of a eukaryotic cell is associated with histone proteins. State one other feature of DNA in a eukaryotic cell that is different from DNA
- June 2024, Paper 3, Q1(a)(i) (1 mark): Name the structure labelled A. A [1]
- June 2024, Paper 3, Q1(a)(ii) (1 mark): Based on your knowledge, estimate the diameter of the E. coli cell. Give your answer in µm. Diameter = µm [1]
- June 2024, AS Paper 1, Q8 (1 mark): Bacillus thuringiensis (Bt) is a species of bacterium that lives in soil. Bt makes proteins that are toxic to some insects when eaten. Which process does not oc
- June 2023, Paper 2, Q16(b)(ii) (2 marks): Bacteria reproduce asexually by a process called binary fission. Suggest why bacteria are unable to reproduce asexually by mitosis. [2]
- June 2023, AS Paper 1, Q10 (1 mark): Which feature is associated with a prokaryotic cell? A Cell walls made of chitin B Extrachromosomal DNA that is circular C Linear DNA that can form plasmids D 7
- June 2022, AS Paper 1, Q18 (1 mark): A student is studying three unicellular organisms: the bacterium Escherichia coli, the protoctist Euglena gracilis and the fungus Saccharomyces cerevisiae. Whic
- November 2021, Paper 3, Q2(c) (2 marks): Mitosis does not occur in bacteria. Bacterial cells divide using binary fission. Binary fission is shown in Fig. 2.2. Fig. 2.2 Bacteria do not have a nucleus. D
- November 2021, AS Paper 1, Q24(b)(i) (1 mark): Suggest one feature of a bacterium the phazolicin might attack. [1]
- November 2020, Paper 1, Q19(c)(i) (2 marks): Give two structural features of mitochondria that support this theory. 1 2 [2]
- November 2020, Paper 2, Q5 (1 mark): The cell labelled E shows a parasite called Trypanosoma. Which of the following statements is/are evidence that Trypanosoma is a eukaryote? a nucleus is present
- November 2020, AS Paper 1, Q26(a)(iii) (1 mark): Describe how the genetic material is arranged in organisms in the same kingdom as Y. pestis. [1]
- June 2019, AS Paper 1, Q25(b)(i) (1 mark): Name the molecule that is found in the cell walls of bacterial cells. [1]
- June 2018, AS Paper 1, Q12 (1 mark): The bacterium Sorangium cellulosum and the fungus Armillaria mellea are both found in soil. Which of the rows, A to D, correctly shows the structures present in
- June 2016, AS Paper 1, Q6 (1 mark): Which of the following structures, A to D, are found in prokaryotes and in eukaryotes? A a cell wall made of peptidoglycan B circular genomic DNA C a nucleus su
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