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IB Biology SL 2.1.8 Selective Membrane Permeability Question Bank

Practise IB Biology SL 2.1.8 using exact SL questions on membrane selectivity, diffusion routes, transport proteins and the role of gradients.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Relate membrane selectivity to the size, polarity and transport route available to each substance.
  • Compare simple diffusion with facilitated diffusion using gradient, protein and energy requirements.
  • Use membrane evidence to choose direct diffusion, a channel or active transport for a solute.

B2.1.8—Selectivity in permeability question 1

[Maximum number: 1]

Which molecule is paired with the component of the cell membrane that allows it to pass through the membrane?

Molecule

Component of the
cell membrane

insulin

aquaporin

glycogen

channel protein

oestradiol

phospholipid bilayer

carbon dioxide

pump protein

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