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IB Biology SL B2.1 Membranes and Membrane Transport Question Bank

Practise IB Biology SL B2.1 by linking membrane structure and selective permeability to diffusion, osmosis, transport proteins and vesicle movement.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • use phospholipid amphipathic structure and membrane proteins to explain selective permeability
  • compare simple diffusion, facilitated diffusion, osmosis and ATP-driven active transport
  • interpret concentration, water movement or membrane diagrams to predict net transport direction

Covered syllabus points

B2.1.1—Lipid bilayers as basisB2.1.2—Bilayers as barriersB2.1.3—Simple diffusionB2.1.4—Integral and peripheral proteinsB2.1.5—Osmosis and aquaporinsB2.1.6—Channel proteinsB2.1.7—Pump proteinsB2.1.8—Selectivity in permeabilityB2.1.9—Glycoproteins and glycolipidsB2.1.10—Fluid mosaic model

B2.1 Membranes and membrane transport question 1

[Maximum number: 3]

The diagram shows the stages of the cell cycle.

Figure for Question B2.1 Membranes and membrane transport question 1 — IB Biology SL

Explain the properties of phospholipids that allow bilayers to form in cell membranes.

B2.1 Membranes and membrane transport question 2

[Maximum number: 4]

Question (a)

(a)

Outline how molecules move across a membrane by simple diffusion.

[ 2 ]

Question (b)

(b)

Explain the role of protein pumps in active transport.

[ 2 ]

B2.1 Membranes and membrane transport question 3

[Maximum number: 2]

List two functions of membrane proteins.

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