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IB Biology HL B2.1.8 Selectivity in Permeability Questions

Analyse how phospholipid properties, concentration gradients and membrane proteins determine whether particles use simple or facilitated diffusion in IB Biology HL B2.1.8.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Distinguish simple diffusion directly through phospholipids from facilitated diffusion through selective membrane proteins.
  • Explain that both routes are passive and move particles down a concentration gradient, while polarity, size and membrane proteins determine permeability.
  • Use paired molecule or transport-data examples to choose simple diffusion or facilitated diffusion as the appropriate membrane route.

IB Biology HL B2.1.8 Selectivity in Permeability Questions 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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