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Glycolysis: Edexcel International A Level Biology questions

Edexcel International A Level Biology past-paper questions on 7.1.2 Glycolysis, 2019–2025, with mark schemes and examiner’s reports where available.

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  1. Q1(c)

    June 2025 · Unit 6

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  2. Q6(a)(i)

    June 2024 · Unit 5

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  3. Q2(b)(ii)

    June 2023 · Unit 5

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  4. Q5(a)(i)

    October 2021 · Unit 5

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  5. Q5(c)

    October 2021 · Unit 5

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  6. Q1(a)

    June 2021 · Unit 5

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  7. Q1(a)(i)

    October 2020 · Unit 5

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All 7 questions on Glycolysis, as a list
  1. June 2025, Unit 6, Q1(c) (3 marks): Describe how ATP and reduced co‑enzyme are produced in anaerobic respiration. (3)
  2. June 2024, Unit 5, Q6(a)(i) (1 mark): The diagram shows what happens to the lactate following exercise. Molecule W Molecule Y Lactate Molecule Z Which row shows the molecules in this diagram? (1) Mo
  3. June 2023, Unit 5, Q2(b)(ii) (2 marks): Cyanide stops the transfer of electrons along the electron transport chain. Explain why cyanide does not affect the production of ATP from anaerobic respiration
  4. October 2021, Unit 5, Q5(a)(i) (1 mark): Which row of the table shows the location of each stage? (1) Glycolysis Link reaction Krebs cycle A cytoplasm cytoplasm cytoplasm B cytoplasm mitochondrial matr
  5. October 2021, Unit 5, Q5(c) (6 marks): The photograph shows a crocodile (Crocodylus porosus) that lives in saltwater habitats. (Source: © Danny Ye/Shutterstock) An investigation measured the lactate
  6. June 2021, Unit 5, Q1(a) (3 marks): One product of all three stages shown in the table is ATP (adenosine triphosphate). Complete the table to show one other product of each stage. (3) Stage One ot
  7. October 2020, Unit 5, Q1(a)(i) (1 mark): Which of the following describes a step in the process of anaerobic respiration? (1) A decarboxylation of lactate B phosphorylation of hexoses C oxidation of py

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