A) Beaker 1 was more hypertonic to the sac and caused a greater gain of water in

Question

A) Beaker 1 was more hypertonic to the sac and caused a greater gain of water into the bag. The solutes pull on water molecules.

B) Beaker 2 and its sac had a smaller concentration gradient than beaker 1 and its sac, so beaker 2 gained less weight. In fact it gained exactly half as much.

C) Beaker 1 and 2 contain hypertonic solutions to their respective sacs, even though they are of different concentrations. Hypertonic solutions always lose water.

D) Weight gain will be expected for any sac placed into a solution. Dialysis sacs are leaky because they have holes in them which model pores in membranes.

E) None of the above is true.

Explanation / Answer

A and C are not true because the beakers are hypotonic to the sacs.
D is incorrect; the pores allow molecules through, but do not make the sacs "leaky."

B is the correct answer.

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