IB Biology HL B2.1.3 Simple diffusion
IB Biology HL B2.1.3 Simple diffusion
Practise explaining simple diffusion across membranes, comparing it with facilitated diffusion and interpreting concentration-gradient data.
How this is tested
- compare simple and facilitated diffusion by protein use and shared passive movement
- explain how a steeper oxygen gradient increases net diffusion into a cell
- interpret diffusion graphs where rates fall as systems approach equilibrium