IB Biology SL B2.1.6 Channel Proteins Questions
Use ion-transport diagrams and concentration-rate graphs to distinguish selective, channel-mediated diffusion from ATP-driven transport.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- Explain why polar amino acids line hydrophilic channels that carry ions or polar solutes.
- Explain channel-mediated facilitated diffusion as selective, passive, down-gradient movement without ATP to equilibrium.
- Interpret chloride graphs showing facilitated-diffusion rate rising before it plateaus.
IB Biology SL B2.1.6 Channel Proteins Questions question 1
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.
Explain facilitated diffusion.
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