AP BIOLOGY

Detailed explanation-1: -The size of the minute pores in the dialysis tubing determines which substance can pass through the membrane. A solution of glucose and starch will be placed inside a bag of dialysis tubing. Distilled water will be placed in a beaker, outside the dialysis bag.

Detailed explanation-2: -To make sure there wasn’t any glucose in the distilled water. 4. How did the beaker water affect the glucose strip after the dialysis bag had been soaking in it? What conclusions can you draw about the movement of glucose molecules across a membrane?

Detailed explanation-3: -The bag filled with the distilled water will decrease in mass as will the dialysis bag with 0.2M of sucrose. The decrease in mass is due to the concentration of the solutes being higher in the solution outside of the dialysis bag, which will cause water to flow out.

Detailed explanation-4: -After filling and tying their dialysis tube bags students need to rinse the bags thoroughly in fresh water to remove any spilled starch or glucose solution from the outside. If you do not have a sink, a series of large containers of water will work.