In this activity, you will demonstrate osmosis and diffusion of molecules through a selectively permeable membrane. You will also determine which molecule(s) flow freely and which molecule(s) remain trapped in the dialysis tubing.
Bio Analyze the cell as a living system.
1.2.1 Compare the mechanisms of active vs. passive transport (diffusion and osmosis).
LO 2.10 The student is able to use representations and models to pose scientific questions about the properties of cell membranes and selective permeability based on molecular structure. [See SP 1.4, 3.1]
LO 2.11 The student is able to construct models that connect the movement of molecules across membranes with membrane structure and function.
Why do cells transport molecules in and out of their membranes?
What is the process of diffusion and osmosis in a selective permeable membrane?