An experiment is set up to model transport across a cell membrane using dialysis (Visking) tubing as shown in the diagram.
After 30 minutes, a sample of the water from the beaker is tested. The iodine test remains yellow-brown, while the Benedict's test turns orange-red after heating.
What do these results show about the size of the molecules?
Both glucose and starch molecules are larger than the pores in the membrane.
Glucose molecules are smaller than the pores, but starch molecules are larger than the pores.
Starch molecules are smaller than the pores, but glucose molecules are larger than the pores.
Both glucose and starch molecules are smaller than the pores in the membrane.