| Free shipping on orders over $199 |  |
Order early for pre-holiday delivery. Flinn will be closed December 24th, 2025,
through January 4th, 2026, reopening Monday, January 5th, 2026.
Orders received after 10:30 AM Central Time on Tuesday, December 23rd, 2025,
will ship after we return.
How does the membrane around a cell help regulate the internal makeup of the cell? With the Membrane Diffusion: Dialysis Demonstration—ChemTopic™ Lab Activity, compare the diffusion of small and large molecules across a semipermeable membrane to illustrate the process of diffusion in cells. Available as part of the Biochemistry: The Molecules of Life—ChemTopic™ Labs digital collection. Click the Price link for digital collection pricing.
1-800-452-1261
