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IB Biology HL 2.1.8 Selective Membrane Permeability Question Bank

Practise IB Biology HL 2.1.8 through exact HL questions on solute selectivity, diffusion mechanisms, membrane proteins and active-transport comparisons.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Analyse how size, polarity and membrane proteins determine the route taken by a solute.
  • Compare simple and facilitated diffusion using gradient, energy and protein requirements.
  • Evaluate transport evidence to distinguish passive protein-mediated movement from active transport.

B2.1.8—Selectivity in permeability question 1

[Maximum number: 1]

Cells use a variety of methods to move particles across membranes. What is a similarity between facilitated diffusion and active transport?

A

Both are carried out by proteins in the membrane.

B

Both move particles against the concentration gradient.

C

Both use ATP.

D

Both move non-polar ions across the membrane.

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