Starch turns a blue-black color in the presence of iodine. Julian decides to use this information to test the permeability of some dialysis tubing. Julian fills the tubing with a starch solution and places it in a beaker of iodine and water. After two hours, the starch solution in the dialysis tubing turns blue-black, and the iodine solution is the same color. What do Julian's results show about the permeability of the tubing?
The membrane is permeable to both starch and iodine
The dialysis tubing is permeable to starch but not to iodine.
The dialysis tubing is permeable to iodine but not to starch.
The dialysis tubing is not permeable to starch or iodine.