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IB Biology SL 2.1.6 Channel Proteins Question Bank

Practise IB Biology SL 2.1.6 using questions on hydrophilic channels, concentration gradients, selective transport and the evidence that distinguishes facilitated diffusion from…

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Explain how channel proteins provide hydrophilic routes for ions and polar molecules across the non-polar membrane core.
  • Relate facilitated diffusion to a concentration gradient and the absence of ATP-driven pumping.
  • Interpret transport-rate evidence to identify channel selectivity, saturation and passive movement.

B2.1.6—Channel proteins question 1

[Maximum number: 3]

The diagram (not to scale) shows a cell which contains water and sodium ions. This cell is immersed in a salt solution of water and sodium ions.

Figure for Question B2.1.6—Channel proteins question 1 — IB Biology SL

Explain facilitated diffusion.

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