Lesson 2.1.5b

2.1.5b Movement of molecules across membranes Quiz: OCR Biology, Unit 1

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 2.1.5b, Movement of molecules across membranes: 20 multiple choice questions for the OCR Biology (H020), Unit 1: Foundations in biology, written with Revision Ninja.

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The 20 questions

  1. Which term describes the passive net movement of particles down a concentration gradient?

    • Endocytosis
    • Osmotic pumping
    • Simple diffusion
    • Active transport

  2. Which membrane components facilitate the diffusion of polar molecules across a bilayer?

    • Phospholipid tails
    • Glycolipids
    • Transport proteins
    • Cholesterol molecules

  3. Which molecule provides the immediate energy source for active transport?

    • ATP
    • Glucose
    • RNA
    • DNA

  4. What process involves bulk transport of material into a cell using ATP?

    • Endocytosis
    • Osmosis
    • Exocytosis
    • Simple diffusion

  5. What process releases bulk material from a cell via vesicle fusion?

    • Phagocytosis
    • Endocytosis
    • Pinocytosis
    • Exocytosis

  6. What term describes net water movement across a membrane down a water potential gradient?

    • Osmosis
    • Facilitated diffusion
    • Active transport
    • Simple diffusion

  7. Which factor increases the rate of diffusion?

    • A steeper concentration gradient
    • A smaller surface area
    • A thicker membrane
    • A lower temperature

  8. The water potential of pure water at standard conditions is:

    • -100 kPa
    • -10 kPa
    • +100 kPa
    • 0 kPa

  9. Which way does water move between pure water (0 kPa) and a solution (-300 kPa)?

    • Equally both ways
    • Into the solution
    • No net movement
    • Into pure water

  10. What term describes a plant cell whose protoplast pulls away from the cell wall?

    • Plasmolysed
    • Turgid
    • Flaccid
    • Lysed

  11. What happens to an animal cell placed in a hypotonic solution?

    • Plasmolysis
    • Turgidity
    • Crenation
    • Lysis

  12. Why does the rate of facilitated diffusion level off at high solute concentrations?

    • Membranes break down
    • Channels close permanently
    • ATP is exhausted
    • Carriers are saturated

  13. Respiratory inhibitors stop active transport across membranes by removing the supply of which molecule?

    • Glucose
    • Oxygen
    • Carbon dioxide
    • ATP

  14. By which mechanism does oxygen cross the phospholipid bilayer of a cell membrane?

    • Active transport
    • Facilitated diffusion
    • Osmosis
    • Simple diffusion

  15. A cube of side 2 cm is used as a model cell. What is its surface area to volume ratio?

    • 1:3
    • 6:1
    • 12:1
    • 3:1

  16. Which energy source is directly required for vesicle formation during endocytosis?

    • Glucose
    • ATP
    • Heat
    • Membrane potential

  17. How does adding solute affect the water potential of an aqueous solution?

    • Makes it lower
    • Makes it zero
    • Makes it higher
    • Has no effect

  18. What type of transport does the sodium-potassium pump perform?

    • Facilitated diffusion
    • Simple diffusion
    • Osmosis
    • Active transport

  19. Which direction does net water movement occur for a cell with water potential -600 kPa in a solution of -300 kPa?

    • Into the cell
    • Active transport only
    • No net movement
    • Out of the cell

  20. What limits the maximum rate of glucose uptake during facilitated diffusion?

    • Thickness of membrane
    • Concentration of ATP
    • Number of carriers
    • Temperature of cytoplasm

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