Question

a dialysis sac that is permeable to glucose and water is filled with water and placed in a beaker containing 20% glucose solution. will there be a net transport of glucose across the dialysis sac? if so, in which direction will the glucose move, into the sac or out of the sac?
yes, glucose will move out of the sac.
yes, glucose will move into the sac.
no, there is no force to drive glucose across the membrane.
there is no net movement, but glucose will move back and forth across the membrane.

Explanation:

Glucose moves down its concentration gradient via diffusion. The beaker has 20% glucose (high concentration), and the sac has 0% glucose (low concentration). Since the membrane is permeable to glucose, net movement occurs into the sac.

Answer:

Yes, glucose will move into the sac.