Question

what can you conclude about the diffusion of iodine, glucose, and starch across the selectively permeable dialysis tubing membrane?
a. diffusion occurred with iodine and glucose because the dialysis tubing membrane contained channels for those molecules.
b. diffusion occurred based on molecular size. iodine and glucose are much smaller molecules than starch; therefore, they were able to diffuse.
c. diffusion occurred with iodine and glucose because their molecular movement is less than that of starch.

Explanation:

Selectively - permeable membranes allow substances to pass based on size. Iodine and glucose are small molecules compared to starch, enabling their diffusion. There are no specific channels for iodine and glucose in dialysis tubing, and molecular movement is not the main factor here.

Answer:

B. Diffusion occurred based on molecular size. Iodine and glucose are much smaller molecules than starch; therefore, they were able to diffuse.