plumiHow do we know about mitochondria and other cell structures?: OCR GCSE Biology B questions
Every OCR GCSE Biology B exam question on B4.2 How do we know about mitochondria and other cell structures?, 2018–2025, with its mark scheme and examiner’s report.
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Q4(d)(i)
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Q4(d)(ii)
The whole paper ↗Q4(d)(iii)
The whole paper ↗Q11(b)(ii)
The whole paper ↗Q6(d)(i)
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Q6(d)(ii)
The whole paper ↗Q1(b)(ii)
The whole paper ↗Q1(d)(i)
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Q1(d)(ii)
The whole paper ↗Q3(d)
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Q3(e)
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Q3(f)
The whole paper ↗Q12(b)(i)
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Q12(b)(ii)
The whole paper ↗Q5(d)
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Q6(b)(i)
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Q6(b)(ii)
The whole paper ↗Q4(c)(i)
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Q4(c)(ii)
The whole paper ↗Q2(d)
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All 29 questions on How do we know about mitochondria and other cell structures?, as a list
- June 2025, Paper 4 Higher, Q4(d)(i) (1 mark): Suggest which type of microscope was used to produce the image in Fig. 4.3. [1]
- June 2025, Paper 4 Higher, Q4(d)(ii) (1 mark): Explain why this type of microscope can show the structure of stomata in great detail. [1]
- June 2025, Paper 4 Higher, Q4(d)(iii) (1 mark): The length of one of the stomata is 10 µm, which is 1 × 10–2 mm. Which of these is the same as 1 × 10–2 mm? Tick (3) one box. 0.001 mm 0.01 mm 10.00 mm 100 mm [
- June 2023, Paper 1 Foundation, Q11(b)(ii) (1 mark): The image shows the mitochondria in a section of heart muscle. The mitochondria are different sizes. One of the mitochondria is labelled. A mitochondria Estimat
- June 2023, Paper 2 Foundation, Q6(d)(i) (1 mark): What is 10 μm to the nearest order of magnitude? Put a ring around the correct option. 100μm 101μm 102μm 103μm [1]
- June 2023, Paper 2 Foundation, Q6(d)(ii) (1 mark): In the dividing cell, a single chromosome has a width of 0.01 μm. How many orders of magnitude larger is the cell than the single chromosome? Put a ring around
- June 2023, Paper 3 Higher, Q1(b)(ii) (1 mark): The image shows the mitochondria in a section of heart muscle. The mitochondria are different sizes. One of the mitochondria is labelled. A mitochondria Estimat
- June 2023, Paper 4 Higher, Q1(d)(i) (1 mark): What is 10 μm to the nearest order of magnitude? Put a ring around the correct option. 100μm 101μm 102μm 103μm [1]
- June 2023, Paper 4 Higher, Q1(d)(ii) (1 mark): In the dividing cell, a single chromosome has a width of 0.01 μm. How many orders of magnitude larger is the cell than the single chromosome? Put a ring around
- June 2022, Paper 1 Foundation, Q3(d) (1 mark): State one reason why an electron microscope can be used to see the detailed structure of mitochondria. [1]
- June 2022, Paper 4 Higher, Q3(e) (1 mark): The length of a cell is 0.00002 m. How is the length of the cell written in standard form? Put a ring around the correct answer. 2 × 10–5 m 2 × 10–4 m 2 × 104 m
- June 2022, Paper 4 Higher, Q3(f) (1 mark): The length of a mitochondrion is 3 × 10–6 m. What is another way to write the length of the mitochondrion? Put a ring around the correct answer. 0.0003 m 0.0000
- November 2021, Paper 3 Higher, Q12(b)(i) (2 marks): The actual size of this cell from points A to B is 80 µm. Calculate the magnification used to produce this drawing. Use the equation: magnification = measured s
- November 2021, Paper 3 Higher, Q12(b)(ii) (3 marks): The magnification of a light microscope is 1.5 × 103. The magnification of an electron microscope is 5 × 105. Calculate the difference in magnification. Give yo
- November 2020, Paper 2 Foundation, Q5(d) (2 marks): Fig. 5.5 shows an image of some of the microorganisms from the mistletoe. Microorganism A 0.003 mm Fig. 5.5 The actual length of microorganism A is 0.003 mm. In
- November 2020, Paper 3 Higher, Q6(b)(i) (1 mark): What type of microscope would be used to take this image? [1]
- November 2020, Paper 3 Higher, Q6(b)(ii) (2 marks): Explain how this type of microscope has increased our understanding of structures such as mitochondria. [2]
- November 2020, Paper 4 Higher, Q4(c)(i) (2 marks): The actual length of bacterium A is 3 μm. In the image in Fig. 4.3 it appears to be 4.5 cm long. 1 μm = 0.0001 cm Calculate the magnification of the image. Use
- November 2020, Paper 4 Higher, Q4(c)(ii) (2 marks): Each bacterium from the tree is 3 × 10–4 cm long. Is it possible that the bacteria from the tree are the same bacteria as bacterium A from the mistletoe? Yes No
- June 2019, Paper 1 Foundation, Q2(d) (1 mark): Electron microscopes can be used to see small cell structures such as mitochondria. Which statement explains why? Tick (3) one box. They are easy to use. They a
- June 2019, Paper 4 Higher, Q4(a)(ii) (2 marks): The length of the stoma in Ling’s photograph is 15 mm. The photograph has a magnification of ×400. Calculate the length of the original stoma. Give your answer
- June 2018, Paper 2 Foundation, Q3(d)(i) (1 mark): What is the diameter of the bacterium, in m, in standard form? Put a ring around the correct answer. 2 × 106 m 206 m 2 × 10−6 m 20−6 m [1]
- June 2018, Paper 2 Foundation, Q3(d)(ii) (1 mark): What is the diameter of the plant cell, in μm? Put a ring around the correct answer. 80−6μm 80 μm 75 μm 40 μm 0.00008 μm [1]
- June 2018, Paper 2 Foundation, Q3(d)(iii) (2 marks): Amir knows that: • most viruses measure less than 250 nm in diameter • his light microscope will not allow him to see objects smaller than 1 μm in diameter. Can
- June 2018, Paper 2 Foundation, Q3(d)(iv) (2 marks): Suggest a piece of apparatus that Amir could use to see viruses in the infected plant cells. Explain your answer. [2]
- June 2018, Paper 4 Higher, Q4(d)(i) (1 mark): Give the mean diameter of the plant cell in μm. Mean diameter = μm [1]
- June 2018, Paper 4 Higher, Q4(d)(ii) (1 mark): Give the mean diameter of the bacterium in m. Give your answer in standard form. Mean diameter = m [1]
- June 2018, Paper 4 Higher, Q4(d)(iii) (2 marks): Give the mean diameter of the plant cell, in m, to the nearest order of magnitude. Mean diameter = m [2]
- June 2018, Paper 4 Higher, Q4(d)(iv) (2 marks): Show that the sizes of the bacterium and the virus are the same order of magnitude. [2]
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