Question

In which direction will WATER molecules (the small blue spheres) move across the membrane in the illustration shown here?

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Question 24 options:

A)
Water will move from A to B


B)
Water will move from B to A


C)
There will be no movement of water

Answer 1

B

Answer 2

Water wants to have the same concentration of molecules on both sides of the membrane. So the water molecules will move from the side of the membrane where they're most crowded (i.e., the highest concentration) toward the side of the membrane where they are less crowded (i.e., lower concentration).