Lesson 3.2.3.2

3.2.3.2 Diffusion, osmosis and active transport Quiz: AQA Biology, Unit 2

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 3.2.3.2, Diffusion, osmosis and active transport: 20 multiple choice questions for the AQA Biology (7402), Unit 2: Cells, written with Revision Ninja.

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The 20 questions

  1. What is the net movement of water across a partially permeable membrane down a water potential gradient?

    • Osmosis
    • Simple diffusion
    • Active transport
    • Facilitated diffusion

  2. Which process requires hydrolysis of ATP to move a substance against its concentration gradient?

    • Active transport
    • Osmosis
    • Facilitated diffusion
    • Simple diffusion

  3. Which process absorbs sodium ions and glucose together into ileum epithelial cells?

    • Active transport
    • Facilitated diffusion
    • Simple diffusion
    • Co-transport

  4. Which type of molecule passes most easily across a membrane by simple diffusion?

    • Large polar
    • Large non-polar
    • Small non-polar
    • Small polar

  5. Which membrane protein forms a water-filled pore for facilitated diffusion of specific ions?

    • Glycoprotein
    • Carrier protein
    • Cholesterol
    • Channel protein

  6. In which direction does water move if cell water potential is -300 kPa and solution is -500 kPa?

    • Out of cell
    • No net movement
    • Into cell
    • In both directions

  7. What happens to carrier proteins when moving molecules by active transport?

    • They change shape
    • They split open
    • They form pores
    • They dissolve

  8. What is the net direction of water movement if a cell has a higher solute concentration than its surroundings?

    • No net movement
    • Into the cell
    • Out of cell
    • Equally both ways

  9. Which change directly increases the rate of facilitated diffusion across a cell membrane?

    • Fewer carrier proteins
    • Thicker phospholipid bilayer
    • More channel proteins
    • Higher ATP concentration

  10. What drives the uptake of glucose against its concentration gradient in ileum epithelial cells?

    • Potassium ion gradient
    • Oxygen concentration gradient
    • Sodium ion gradient
    • Direct ATP hydrolysis

  11. What is the water potential of plant tissue when placed in a sucrose solution causing no mass change?

    • Equal to solution
    • Zero kilopascals
    • Lower than solution
    • Higher than solution

  12. Which energy source is directly required for active transport across a cell membrane?

    • Sodium ion influx
    • Glucose oxidation
    • Thermal energy
    • ATP hydrolysis

  13. Which membrane transport process stops immediately if cellular ATP production is inhibited?

    • Simple diffusion
    • Osmosis
    • Active transport
    • Facilitated diffusion

  14. Which feature of an exchange surface increases the rate of diffusion according to Fick's Law?

    • Long diffusion pathway
    • Thick membrane
    • Large surface area
    • Small surface area

  15. A cell with water potential -200 kPa is placed in a -400 kPa sucrose solution. What happens?

    • Water enters cell
    • Water leaves cell
    • No water movement
    • Sucrose enters cell

  16. Which ion gradient powers the co-transport of glucose into ileum epithelial cells?

    • Chloride ions
    • Sodium ions
    • Potassium ions
    • Calcium ions

  17. Why does a larger membrane surface area increase the rate of transport?

    • Shorter diffusion distance
    • Higher kinetic energy
    • Steeper concentration gradient
    • More transport sites

  18. Which molecule crosses cell membranes directly by simple diffusion?

    • Oxygen
    • Sodium ions
    • Glucose
    • Water

  19. Water potential is -150 kPa in solution A and -250 kPa in a cell. Where does water move?

    • Into the cell
    • No net movement
    • Out of the cell
    • Into solution A

  20. Which transport mechanism moves glucose into cells using a sodium ion gradient?

    • Active transport
    • Simple diffusion
    • Facilitated diffusion
    • Co-transport

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