Question

what conclusion can the student draw about the membrane of her model cell?
a. the membrane allows the larger iodine molecules to pass through, but it does not allow the smaller starch molecules to pass through.
b. the membrane allows the smaller starch molecules to pass through, but it prevents the larger iodine molecules from passing through.
c. the membrane allows the larger starch molecules to pass through, but it prevents the smaller iodine molecules from passing through.
d. the membrane allows the smaller iodine molecules to pass through, but it does not allow the larger starch molecules to pass through.

Explanation:

In diffusion - osmosis experiments, semi - permeable membranes allow smaller molecules to pass through and block larger ones. Iodine molecules are smaller than starch molecules. So, the membrane would allow iodine to pass but not starch.

Answer:

D. The membrane allows the smaller iodine molecules to pass through, but it does not allow the larger starch molecules to pass through.