plumiEukaryotic cell ultrastructure: OCR A‑Level Biology A questions
OCR A-Level Biology A past-paper questions on 2.1.1.3 Eukaryotic cell ultrastructure, 2016–2025, with mark schemes and examiner’s reports where available.
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All 16 questions on Eukaryotic cell ultrastructure, as a list
- June 2025, AS Paper 1, Q7 (1 mark): Which component is made in the smooth endoplasmic reticulum? Your answer [1]
- June 2024, Paper 2, Q14 (1 mark): Identify the structure labelled X. A Centriole B Lysosome C Mitochondrion D Nucleolus Your answer [1]
- June 2024, Paper 2, Q15 (1 mark): Identify the structure labelled Y. A Cell wall B Cilium C Plasma membrane D Smooth ER Your answer [1]
- June 2023, AS Paper 1, Q28(a) (4 marks): Four organelles are listed in the table below. Complete the table. For each organelle place a tick (3) in the box for a correct description and leave the box em
- June 2022, Paper 3, Q2(b)(ii) (2 marks): A scientist calculated two values for the lysosomes in a white blood cell: mean volume of a lysosome = 6.5 × 10–14 cm3 • mean number of H+ ions per lysosome = 1
- June 2022, Paper 3, Q2(b)(iii) (1 mark): The formula used to calculate pH is pH = -log [H+] where [H+] is H+ ion concentration in mol dm–3. Use your answer from part (ii) to calculate the mean pH of th
- November 2020, Paper 1, Q19(a)(i) (1 mark): State the type of microscope used to produce this image. [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, AS Paper 1, Q23(a) (3 marks): Describe the structure of the rough endoplasmic reticulum. [3]
- November 2020, AS Paper 2, Q2(a)(i) (1 mark): Suggest why goblet cells have large numbers of the cellular component labelled A. [1]
- June 2019, Paper 1, Q16(c) (1 mark): Brown fat is a type of tissue. Brown fat has a higher need for oxygen because fat cells in this tissue carry out aerobic respiration at a higher rate than fat c
- June 2019, Paper 3, Q1(a)(i) (2 marks): Identify the cellular components shown at A and B. A B [2]
- June 2018, Paper 3, Q1(a) (2 marks): The table below contains statements about the root cells of an onion. Place ticks (3) in the boxes in the table to indicate whether the statements are true or f
- June 2017, Paper 1, Q4 (1 mark): Which of the options, A to D, occurs in the nucleus of a cell? A synthesis of enzymes B synthesis of RNA C modification of polypeptides D synthesis of carbohydr
- June 2017, AS Paper 2, Q1(a)(i) (1 mark): Cell B in Fig. 1.1 was observed using an electron microscope. Give one piece of evidence from Fig. 1.1 that supports this. [1]
- June 2016, AS Paper 1, Q21(b)(i) (3 marks): Identify the parts of the cell labelled X, Y and Z. X Y Z [3]
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