Lesson 5.2.2b

5.2.2b Oxidative phosphorylation and anaerobic respiration Quiz: OCR Biology, Unit 6

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 5.2.2b, Oxidative phosphorylation and anaerobic respiration: 20 multiple choice questions for the OCR Biology (H020), Unit 6: Energy for biological processes, written with Revision Ninja.

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The 20 questions

  1. What is the final electron acceptor in oxidative phosphorylation?

    • NADP
    • Carbon dioxide
    • Pyruvate
    • Oxygen

  2. Where in a mitochondrion is the electron transport chain located?

    • Inner membrane
    • Matrix
    • Intermembrane space
    • Outer membrane

  3. Which enzyme uses the flow of protons to make ATP from ADP and inorganic phosphate?

    • Pyruvate decarboxylase
    • Lactate dehydrogenase
    • RuBisCO
    • ATP synthase

  4. In mammalian muscle during anaerobic respiration, what is pyruvate converted into?

    • Lactate
    • Glucose
    • Ethanol
    • Acetyl CoA

  5. What are the end products of anaerobic respiration in yeast?

    • Lactate and CO2
    • Ethanol and CO2
    • Lactate and ATP
    • Pyruvate and water

  6. Into which compartment are protons pumped during oxidative phosphorylation?

    • Intermembrane space
    • Outer membrane
    • Mitochondrial matrix
    • Cytoplasm

  7. What is the main benefit of anaerobic respiration when oxygen is absent?

    • Glucose synthesis
    • Carbon dioxide uptake
    • Continued ATP production
    • Higher ATP yield

  8. A mammalian cell respires one glucose molecule anaerobically. What is the net yield of ATP?

    • 4
    • 36
    • 2
    • 30

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

    • To hydrolyse ATP
    • To continue glycolysis
    • To enter mitochondria
    • To produce water

  10. What happens to the ATP yield per glucose when yeast switches to anaerobic respiration?

    • It increases
    • It decreases
    • It remains constant
    • It doubles

  11. Aerobic respiration of one glucose gives about 30 ATP, while anaerobic respiration gives 2. By roughly what factor is the aerobic yield greater?

    • About 2 times
    • About 5 times
    • About 30 times
    • About 15 times

  12. Which pathway does not occur during mammalian anaerobic respiration?

    • Lactate fermentation
    • Glycolysis
    • Krebs cycle
    • Glucose phosphorylation

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

    • Proton pump donor
    • ATP synthase activator
    • Terminal electron acceptor
    • Primary carbon acceptor

  14. What is the main structural function of cristae in mitochondria?

    • Increase surface area
    • Store glucose
    • Lower matrix pH
    • Synthesise pyruvate

  15. What directly drives ATP synthesis by ATP synthase in mitochondria?

    • Oxygen consumption
    • Proton flow
    • Electron transfer
    • Pyruvate oxidation

  16. Why does anaerobic respiration produce much less ATP per glucose molecule than aerobic respiration?

    • Oxidative phosphorylation operates
    • Krebs cycle continues
    • Chemiosmosis occurs
    • Only glycolysis occurs

  17. A mammalian muscle cell uses only anaerobic respiration and consumes 0.5 mol of glucose. How many moles of ATP are made, given a net yield of 2 ATP per glucose?

    • 4
    • 0.5
    • 2
    • 1

  18. What is the main advantage of anaerobic respiration during intense exertion such as sprinting?

    • Long-lasting energy
    • High ATP yield
    • Rapid ATP production
    • Lactate breakdown

  19. What is maintained across the inner mitochondrial membrane to drive ATP synthesis?

    • Proton gradient
    • Pyruvate gradient
    • Electron gradient
    • Oxygen gradient

  20. In mammalian anaerobic respiration, what is pyruvate reduced to in order to regenerate NAD?

    • Ethanol
    • Lactate
    • Acetyl CoA
    • Oxaloacetate

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