Today, the Bio class did three labs about cell movement or transport. The first is this Diffusion Lab. The questions are good for explaining the selective permeability of cell embraces. Use the pix from Biology Place’s Diffusion Lab if you like step by step instructions. You need iodine, cornstarch and baggies. The cheapest baggies work best. (Traditionally, dialysis tubing is used for this lab. My colleague, Wendy, told me to use cheap baggies instead.) Next we soaked growing spheres in three solutions to do the lab, Simulating Osmosis with Orbeez Water Beads. Lastly the kids made Gel Beads, using these instructions and these to test yeast balls in hydrogen peroxide. This last lab is more expensive and uses sodium alginate and calcium lactate. It is also more of a pain to set up and conduct.
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