Question

q6. a simcell with a water - permeable membrane that contains 20 hemoglobin molecules and 480 water molecules is placed into an extracellular fluid that contains 20 dextrose molecules and 480 water molecules. which of the following should happen? more water molecules will flow from the simcell into the extracellular fluid than from the extracellular fluid into the simcell. more water molecules will flow from the extracellular fluid into the simcell than from the simcell into the extracellular fluid. there will be no movement of water molecules across the membrane. water molecules will move back and forth equally across the membrane.

Explanation:

Osmosis occurs based on solute - solvent concentration differences. Here, the number of water molecules and non - water molecules (hemoglobin in cell and dextrose in extracellular fluid) is the same on both sides. So, the water potential is equal on both sides of the water - permeable membrane. Water molecules move randomly, and at equilibrium, they move back and forth equally across the membrane due to equal water potential.

Answer:

Water molecules will move back and forth equally across the membrane.