Lesson 3.5.2.2

3.5.2.2 Oxidative phosphorylation and anaerobic respiration Quiz: AQA Biology, Unit 5

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.5.2.2, Oxidative phosphorylation and anaerobic respiration: 20 multiple choice questions for the AQA Biology (7402), Unit 5: Energy transfers in and between organisms, written with Revision Ninja.

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The 20 questions

  1. Where on the mitochondrion does oxidative phosphorylation occur?

    • Matrix
    • Cristae
    • Outer membrane
    • Stroma

  2. What is the final electron acceptor in aerobic respiration?

    • NAD
    • Pyruvate
    • Carbon dioxide
    • Oxygen

  3. What is the product formed when oxygen accepts electrons and protons at the end of the electron transfer chain?

    • Lactate
    • Carbon dioxide
    • Water
    • Ethanol

  4. What directly drives the synthesis of ATP by ATP synthase during oxidative phosphorylation?

    • Oxygen diffusion
    • Electron flow
    • Active transport
    • Proton flow

  5. Which theory describes ATP synthesis driven by a proton gradient?

    • Mass flow hypothesis
    • Sliding filament theory
    • Fluid mosaic theory
    • Chemiosmotic theory

  6. Why must reduced NAD be reoxidised during anaerobic respiration?

    • To produce ATP
    • To form lactate
    • To bind oxygen
    • To allow glycolysis

  7. In anaerobic respiration in animal muscle, what is the final product formed from pyruvate?

    • Lactate
    • Oxygen
    • Acetylcoenzyme A
    • Ethanol

  8. What are the products of anaerobic respiration in yeast?

    • Lactate and CO2
    • Lactate only
    • Ethanol and CO2
    • Ethanol and water

  9. What is the final electron acceptor at the end of the electron transfer chain?

    • Oxygen
    • Water
    • Carbon dioxide
    • NAD

  10. Which coenzyme gives more ATP per molecule when oxidised in oxidative phosphorylation?

    • Oxidised NAD
    • Reduced FAD
    • Oxidised FAD
    • Reduced NAD

  11. Where are protons pumped to create the gradient used by ATP synthase?

    • Stroma
    • Cytoplasm
    • Intermembrane space
    • Mitochondrial matrix

  12. What is the net yield of ATP per glucose molecule in anaerobic respiration?

    • 2 ATP molecules
    • 0 ATP molecules
    • 32 ATP molecules
    • 38 ATP molecules

  13. What is the role of oxygen in oxidative phosphorylation?

    • Primary electron donor
    • Final electron acceptor
    • Final proton donor
    • Coenzyme reoxidiser

  14. What is pyruvate converted to during anaerobic respiration in human muscle tissue?

    • Oxaloacetate
    • Lactate
    • Ethanol
    • Acetyl CoA

  15. Calculate how many reduced NAD molecules are produced by the link reaction and Krebs cycle together, per glucose molecule.

    • 8
    • 2
    • 10
    • 6

  16. Why does the Krebs cycle stop in the absence of oxygen?

    • NAD lacks reoxidation
    • ATP synthesis stops
    • Pyruvate breaks down
    • Glucose runs out

  17. Where do protons flow through to drive ATP synthesis during oxidative phosphorylation?

    • Cytochrome c
    • ATP synthase
    • Phospholipid bilayer
    • Coenzyme A

  18. Anaerobic respiration in yeast releases which gas, along with ethanol?

    • Oxygen
    • Carbon dioxide
    • Nitrogen
    • Hydrogen

  19. Where are protons pumped during electron transfer in mitochondria?

    • Mitochondrial matrix
    • Cytoplasm
    • Outer membrane
    • Intermembrane space

  20. What is the net ATP yield from anaerobic respiration of one glucose molecule in a cell, as set by glycolysis alone?

    • 38
    • 36
    • 4
    • 2

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