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Membrane Structure and Function · CAPE Biology Unit 1

74 past-paper questions on Membrane Structure and Function, part of Cell and Molecular Biology, from every CAPE Biology Unit 1 paper on Quelpr.

Practise Membrane Structure and Function
  1. 1(a)(i)5 marks· Biology · Unit 1 Q1 1(a)(i)On the line next to EACH of the photographs, indicate whether the fluid bathing the cell is isotonic, hypertonic or hypotonic.
  2. 1(a)(ii)1 mark· Biology · Unit 1 Q1 1(a)(ii)On the line next to EACH of the photographs, indicate whether the fluid bathing the cell is isotonic, hypertonic or hypotonic.
  3. 1(a)(iii)1 mark· Biology · Unit 1 Q1 1(a)(iii)On the line next to EACH of the photographs, indicate whether the fluid bathing the cell is isotonic, hypertonic or hypotonic.
  4. 1(a)(iv)1 mark· Biology · Unit 1 Q1 1(a)(iv)On the line next to EACH of the photographs, indicate whether the fluid bathing the cell is isotonic, hypertonic or hypotonic.
  5. 1(a)(v)1 mark· Biology · Unit 1 Q1 1(a)(v)On the line next to EACH of the photographs, indicate whether the fluid bathing the cell is isotonic, hypertonic or hypotonic.
  6. 1(b)3 marks· Biology · Unit 1 Q1 1(b)Describe how phospholipids are oriented to form the lipid bilayer of cellular membranes.
  7. 1(b)5 marks· Biology · Unit 1 Q1 1(b)On the grid provided on page 3, plot the data in Table 2 as a line graph.
  8. 1(b)(i)5 marks· Biology · Unit 1 Q1 1(b)(i)Draw a simple labelled diagram to illustrate the fluid mosaic model of plasma membrane structure.
  9. 1(b)(i)1 mark· Biology · Unit 1 Q1 1(b)(i)Suggest why the sizes of the red blood cells in photographs 1 – 3 change.
  10. 1(b)(ii)3 marks· Biology · Unit 1 Q1 1(b)(ii)Account for the shape of the graph. Include in your account a brief description of the shape of the graph.
  11. 1(b)(ii)3 marks· Biology · Unit 1 Q1 1(b)(ii)With reference to the fluid mosaic model, explain how large polar molecules can pass through the membrane.
  12. 1(b)(ii)1 mark· Biology · Unit 1 Q1 1(b)(ii)Suggest why the sizes of the plant cells in photographs 4 – 5 do not change.
  13. 1(c)1 mark· Biology · Unit 1 Q1 1(c)State the name of the lipid responsible for maintaining the fluidity of cellular membranes.
  14. 1(c)1 mark· Biology · Unit 1 Q1 1(c)Calculate the increase in size of red blood cells in photograph 3 over those in photograph 1.
  15. 1(c)(i)4 marks· Biology · Unit 1 Q1 1(c)(i)Outline a simple investigation to determine which solution has the same water potential as the potato.
  16. 1(c)(ii)1 mark· Biology · Unit 1 Q1 1(c)(ii)Describe the expected observation in the solution with the same water potential as the potato.
  17. 1(d)4 marks· Biology · Unit 1 Q1 1(d)Describe how intrinsic proteins allow the movement of substances across cellular membranes.
  18. 1(d)1 mark· Biology · Unit 1 Q1 1(d)When plant cells appear as in photograph 5, what is the specific name given to this condition?
  19. 1(e)1 mark· Biology · Unit 1 Q1 1(e)Name THREE processes by which water and solutes can enter into a living plant or animal cell.
  20. 4(a)4 marks· Biology · Unit 1 Q4 4(a)Define the term 'diffusion', and distinguish between active transport and facilitated diffusion in cells.
  21. 4(a)10 marks· Biology · Unit 1 Q4 4(a)Give a detailed and precise description of the structures of the cell membrane.
  22. 4(a)8 marks· Biology · Unit 1 Q4 4(a)Draw a large, labelled diagram to show the structure and composition of the fluid mosaic membrane. Describe the function of FOUR of the labelled structures.
  23. 4(a)(i)5 marks· Biology · Unit 1 Q4 4(a)(i)Name FIVE chemical components in the structure of cell membranes and state the function of EACH component named.
  24. 4(a)(ii)2 marks· Biology · Unit 1 Q4 4(a)(ii)Identify the chemical component of cell membranes that enables facilitated diffusion to occur, and explain how this occurs.
  25. 4(a)(ii)4 marks· Biology · Unit 1 Q4 4(a)(ii)Phospholipids are a major component of the plasma membrane of a cell and are arranged as a lipid bi-layer. With reference to the properties of phospholipids, explain why these lipids are arranged as a bi-layer in the…
  26. 4(a)(ii)5 marks· Biology · Unit 1 Q4 4(a)(ii)With reference to the fluid mosaic model, discuss the role of phospholipids and proteins in cell membrane functioning.
  27. 4(b)6 marks· Biology · Unit 1 Q4 4(b)Discuss the processes involved and give reasons for these results.
  28. 4(b)(i)6 marks· Biology · Unit 1 Q4 4(b)(i)With the aid of a simplified labelled diagram, describe the fluid mosaic model of membrane structure.
  29. 4(b)(i)4 marks· Biology · Unit 1 Q4 4(b)(i)Osmosis and endocytosis are cellular processes involved in the transport of materials across the plasma membrane. Describe TWO ways in which these processes differ.
  30. 4(b)(ii)5 marks· Biology · Unit 1 Q4 4(b)(ii)With reference to the fluid mosaic model, discuss how polar molecules and ions are transported.
  31. 4(b)(ii)2 marks· Biology · Unit 1 Q4 4(b)(ii)Give TWO examples of the use of endocytosis for the uptake of nutrients in animal systems.
  32. 4(c)6 marks· Biology · Unit 1 Q4 4(c)Discuss the mode of operation of primary pumps for moving ions in and out of cells.
  33. 4(c)6 marks· Biology · Unit 1 Q4 4(c)Distinguish between endocytosis and exocytosis, and briefly comment on ONE cellular process that involves exocytosis.
  34. 5(a)6 marks· Biology · Unit 1 Q5 5(a)Describe the structure of the membrane of a typical cell, and identify its component parts and their biochemical nature.
  35. 5(b)(i)8 marks· Biology · Unit 1 Q5 5(b)(i)Entry of useful minerals, such as potassium
  36. 5(b)(ii)1 mark· Biology · Unit 1 Q5 5(b)(ii)Absorption of large molecules by endocytosis
  37. 5(b)(iii)1 mark· Biology · Unit 1 Q5 5(b)(iii)Entry of non-ionic molecules such as sucrose
  38. 5(b)(iv)1 mark· Biology · Unit 1 Q5 5(b)(iv)Prevention of entry of toxic molecules such as copper or lead
  39. 5(c)6 marks· Biology · Unit 1 Q5 5(c)When strips of potato tissue are immersed in distilled water for two hours, they increase in length and become turgid. Relate this outcome to the exact causes and processes occurring in the cells of the tissue.
  40. Q121 mark · multiple choice· CAPE Biology Unit 1 · 2007 · Paper 1Which of the following identifies the structure represented by X in the diagram below?
  41. Q131 mark · multiple choice· CAPE Biology Unit 1 · 2007 · Paper 1Four identical samples of plant tissue are placed in four different solutions. Each sample of plant tissue has a water potential of -800 kPa. In which solution would full plasmolysis occur within the tissue? The…
  42. Q111 mark · multiple choice· CAPE Biology Unit 1 · 2007 (Specimen) · Paper 1Item 11 refers to the figure below which shows part of the cell-surface membrane of a red blood cell. Molecule Z acts as a carrier to transport selected substances across the membrane. Which of the following substances…
  43. Q121 mark · multiple choice· CAPE Biology Unit 1 · 2007 (Specimen) · Paper 1\text{Na}^+ and \text{K}^+ cannot pass freely into a cell across the phospholipid bilayer because
  44. Q121 mark · multiple choice· CAPE Biology Unit 1 · 2008 (Rest of Region) · Paper 1Item 12 refers to the diagram below. The figure above BEST demonstrates
  45. Q131 mark · multiple choice· CAPE Biology Unit 1 · 2008 (Rest of Region) · Paper 1When a plant cell is placed in a solution with a less negative water potential than its cell sap, the cell becomes more
  46. Q101 mark · multiple choice· CAPE Biology Unit 1 · 2009 · Paper 1Materials are moved in and out of cells by various mechanisms. Which of the following mechanisms are affected by respiration? I. Facilitated diffusion II. Osmosis III. Active transport IV. Exocytosis
  47. Q111 mark · multiple choice· CAPE Biology Unit 1 · 2010 · Paper 1A plant cell is placed in a solution with a less negative water potential than its cell sap. This results in the cell becoming more
  48. Q131 mark · multiple choice· CAPE Biology Unit 1 · 2010 · Paper 1Item 13 refers to the diagram below which shows a plasma membrane. The figure above BEST demonstrates
  49. Q111 mark · multiple choice· CAPE Biology Unit 1 · 2011 · Paper 1Which of the following correctly describes the importance of cholesterol in a cell membrane?
  50. Q121 mark · multiple choice· CAPE Biology Unit 1 · 2011 · Paper 1Which of the following events does NOT involve the movement of ions/chemicals across cell membranes?
  51. Q141 mark · multiple choice· CAPE Biology Unit 1 · 2011 · Paper 1Item 14 refers to the diagram below which shows a plasma membrane. The diagram above BEST demonstrates
  52. Q101 mark · multiple choice· CAPE Biology Unit 1 · 2012 · Paper 1The figure above BEST demonstrates
  53. Q111 mark · multiple choice· CAPE Biology Unit 1 · 2012 · Paper 1When a plant cell is placed in a solution with a less negative water potential than its cell sap, the cell becomes more
  54. Q121 mark · multiple choice· CAPE Biology Unit 1 · 2012 · Paper 1Which of the following events does NOT involve the movement of ions/chemicals across cell membranes?
  55. Q111 mark · multiple choice· CAPE Biology Unit 1 · 2013 · Paper 1Which of the following correctly describes the importance of cholesterol in a cell membrane?
  56. Q121 mark · multiple choice· CAPE Biology Unit 1 · 2013 · Paper 1Four cylinders of equal mass are cut from a single potato. One cylinder is placed in distilled water and the others in 0.2 M, 0.4 M and 0.8 M sucrose solution respectively. Each cylinder is weighed at ½ hour intervals…
  57. Q141 mark · multiple choice· CAPE Biology Unit 1 · 2013 · Paper 1Which of the structures A, B, C or D is important for cell to cell recognition?
  58. Q111 mark · multiple choice· CAPE Biology Unit 1 · 2014 · Paper 1The table below shows three processes involved in the movement of substances across cell membranes. Which of the following correctly states whether the three processes shown are active or passive in nature?…
  59. Q121 mark · multiple choice· CAPE Biology Unit 1 · 2014 · Paper 1Four cylinders of equal mass are cut from a single potato. One cylinder is placed in distilled water and the others in 0.2\text{ M}, 0.4\text{ M} and 0.8\text{ M} sucrose solution, respectively. Each cylinder is…
  60. Q101 mark · multiple choice· CAPE Biology Unit 1 · 2015 · Paper 1Bobby is given a tropical freshwater fish for his birthday. Experimenting with the fish, he places it in seawater and it dies. Which of the following statements MOST likely explains the reason for its death?
  61. Q111 mark · multiple choice· CAPE Biology Unit 1 · 2015 · Paper 1Which of the following correctly describes the importance of cholesterol in a cell membrane?
  62. Q121 mark · multiple choice· CAPE Biology Unit 1 · 2015 · Paper 1A plant cell is placed in Solution A, which has a lower water potential than the cell contents. Which of the following combinations shows the MOST likely change in the cell and the cause of the change?
  63. Q131 mark · multiple choice· CAPE Biology Unit 1 · 2015 · Paper 1Which of the structures, A, B, C or D, is important for cell to cell recognition?
  64. 1(b)(i)2 marks· CAPE Biology Unit 1 · May/June 2019 · Paper 2Describe the changes in the rate of uptake of Substance A and Substance B as solute concentration increases as depicted in Figure 2.
  65. 1(b)(ii)2 marks· CAPE Biology Unit 1 · May/June 2019 · Paper 2Identify the types of diffusion illustrated for Substance A and Substance B in Figure 2.
  66. 1(b)(iii)4 marks· CAPE Biology Unit 1 · May/June 2019 · Paper 2Compare and contrast the two types of diffusion identified in (b)(ii).
  67. 1(b)(iv)6 marks· CAPE Biology Unit 1 · May/June 2019 · Paper 2Arrange CO2, glucose, water, and RNA in order of ability to diffuse through a lipid bilayer, starting with the easiest, and explain the order.
  68. 1(c)8 marks· CAPE Biology Unit 1 · May/June 2019 · Paper 2With the aid of an annotated diagram, explain the organization of membrane lipids, and discuss the structure of a cell membrane specifying lipid organization and protein associations.
  69. 1(b)(i)2 marks· CAPE Biology Unit 1 · May/June 2024 · Paper 2Define the term 'simple diffusion'.
  70. 1(b)(ii)3 marks· CAPE Biology Unit 1 · May/June 2024 · Paper 2Name the mechanisms by which the molecules move directly from A across the membrane to B, for EACH of the illustrations labelled X–Z in Figure 1.
  71. 1(b)(iii)5 marks· CAPE Biology Unit 1 · May/June 2024 · Paper 2Outline a suitable procedure for investigating the tonicity of the three unknown solutions using the provided apparatus and materials (red onion, water, scalpel, distilled water, dropper, forceps, glass slides,…
  72. 1(c)(i)3 marks· CAPE Biology Unit 1 · May/June 2024 · Paper 2Based on the structure of ergosterol compared with cholesterol shown in Figure 2, suggest the function of ergosterol in the cell membrane of yeast cells.
  73. 1(c)(ii)9 marks· CAPE Biology Unit 1 · May/June 2024 · Paper 2Explain the functions of the THREE components of the cell membrane of the red blood cell as shown in Figure 3 based on the fluid mosaic model. Present your response in complete paragraphs.
  74. 1(c)9 marks· CAPE Biology Unit 1 · May/June 2025 · Paper 2Using Figure 3 and the provided information, explain how EACH mitochondrial protein moves molecules across the membrane differently in complete paragraphs: - Fatty acid transporter - Potassium–hydrogen ion exchanger -…

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