Cell Membrane Permeability Lab

Cell Membrane Permeability Lab
Cell Membrane Permeability Lab
Cell Membrane Permeability Lab
Cell Membrane Permeability Lab
Cell Membrane Permeability Lab
Cell Membrane Permeability Lab
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This lab uses dialysis tubing to model the semi-permeability of cell membranes. You'll need to have dilute iodine solution and starch solution (I just use corn starch and water) prepared ahead of time. Students create a "bag" out of the dialysis tubing, fill it with starch, and then place the bag in iodine. Over a few minutes, the smaller iodine atoms diffuse into the bag, turning the starch purple/black. The lab goes on to ask students to answer a series of analysis questions and to write a conclusion.

This lab is also great because it allows you to connect the students back to earlier content: Iodine is an element so it is very small, starch is a macromolecule so it is very large and therefore cannot fit through the tiny holes in the dialysis tubing.

If you have any questions or feedback, please don't hesitate to reach out. Thanks for visiting!
Total Pages
2 pages
Answer Key
Does not apply
Teaching Duration
45 minutes
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