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Importance of ATP: WJEC A‑Level Biology questions

Every WJEC A-Level Biology exam question on 3.1 Importance of ATP, 2016–2025, with its mark scheme and examiner’s report.

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1,223 questions

  1. Q1(c)(i)

    Summer 2025 · Unit 3

    4 marks3.1 Importance of ATP
    The whole paper ↗
    Summer 2025 Unit 3, question 1(c)(i): Describe what is represented by the arrows on the following structures in Image 1 I. Proteins: V, X and Y; [2] II. Structure Z. [2]

  2. Q3(b)(i)

    Summer 2023 · Unit 3

    1 mark3.1 Importance of ATP
    The whole paper ↗
    Summer 2023 Unit 3, question 3(b)(i): Name the organelles in which the membranes (shown in Image 3.2) would be found. [1] A . . B . .

  3. Q3(b)(ii)

    Summer 2023 · Unit 3

    3 marks3.1 Importance of ATP
    The whole paper ↗
    Summer 2023 Unit 3, question 3(b)(ii): In Image 3.2, X, Y and Z represent membranes and compartments found in organelles A and B. Complete the Table 3.3 to name the membranes and compartments represe

  4. Q3(b)(iii)

    Summer 2023 · Unit 3

    5 marks3.1 Importance of ATP
    The whole paper ↗
    Summer 2023 Unit 3, question 3(b)(iii): Describe how the components in the membrane of organelle B are involved in the synthesis of ATP by chemiosmosis. [5] The experiment shown in Image 3.4 is consid

  5. Q3(c)

    Summer 2023 · Unit 3

    4 marks3.1 Importance of ATP
    The whole paper ↗
    Summer 2023 Unit 3, question 3(c): Explain why the experiment shown in Image 3.4 supports the chemiosmotic theory. [4]

  6. Q4(b)(ii)

    Summer 2019 · Unit 3

    2 marks3.1 Importance of ATP
    The whole paper ↗
    Summer 2019 Unit 3, question 4(b)(ii): When ADP was added to the solution, the concentration of oxygen present dropped by 40%. Explain this observation. [2]

  7. Q6(a)

    Summer 2018 · Unit 3

    1 mark3.1 Importance of ATP
    The whole paper ↗
    Summer 2018 Unit 3, question 6(a): Cytochrome oxidase is the final protein in the electron transport chain. It is an enzyme which transfers the electrons to an oxygen molecule. State the final pr

  8. Q6(c)

    Summer 2018 · Unit 3

    2 marks3.1 Importance of ATP
    The whole paper ↗
    Summer 2018 Unit 3, question 6(c): Cytochrome bc1 is a proton pump that transfers protons into the inter-membrane space. Antimycin is a chemical that binds to cytochrome bc1 and blocks its action

  9. Q6(d)(i)

    Summer 2018 · Unit 3

    2 marks3.1 Importance of ATP
    The whole paper ↗
    Summer 2018 Unit 3, question 6(d)(i): Explain why the presence of oligomycin A in a human causes high levels of reduced NAD to form in the cell. [2]
All 9 questions on Importance of ATP, as a list
  1. Summer 2025, Unit 3, Q1(c)(i) (4 marks): Describe what is represented by the arrows on the following structures in Image 1 I. Proteins: V, X and Y; [2] II. Structure Z. [2]
  2. Summer 2023, Unit 3, Q3(b)(i) (1 mark): Name the organelles in which the membranes (shown in Image 3.2) would be found. [1] A . . B . .
  3. Summer 2023, Unit 3, Q3(b)(ii) (3 marks): In Image 3.2, X, Y and Z represent membranes and compartments found in organelles A and B. Complete the Table 3.3 to name the membranes and compartments represe
  4. Summer 2023, Unit 3, Q3(b)(iii) (5 marks): Describe how the components in the membrane of organelle B are involved in the synthesis of ATP by chemiosmosis. [5] The experiment shown in Image 3.4 is consid
  5. Summer 2023, Unit 3, Q3(c) (4 marks): Explain why the experiment shown in Image 3.4 supports the chemiosmotic theory. [4]
  6. Summer 2019, Unit 3, Q4(b)(ii) (2 marks): When ADP was added to the solution, the concentration of oxygen present dropped by 40%. Explain this observation. [2]
  7. Summer 2018, Unit 3, Q6(a) (1 mark): Cytochrome oxidase is the final protein in the electron transport chain. It is an enzyme which transfers the electrons to an oxygen molecule. State the final pr
  8. Summer 2018, Unit 3, Q6(c) (2 marks): Cytochrome bc1 is a proton pump that transfers protons into the inter-membrane space. Antimycin is a chemical that binds to cytochrome bc1 and blocks its action
  9. Summer 2018, Unit 3, Q6(d)(i) (2 marks): Explain why the presence of oligomycin A in a human causes high levels of reduced NAD to form in the cell. [2]

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