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Q7. A SimCell with a water-permeable membrane that contains 20 hemoglobin molecules and 480 water molecules is placed in an extracellular fluid that contains 40 dextrose molecules and 960 water molecules.

Which of the following should happen?

A. More water molecules will flow from the SimCell into the extracellular fluid than from the extracellular fluid into the SimCell.

B. More water molecules will flow from the extracellular fluid into the SimCell than from the SimCell into the extracellular fluid.

C. There will be no movement of water molecules across the membrane.

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

Answer :

Final answer:

In this scenario, more water molecules will flow from the SimCell into the extracellular fluid than from the extracellular fluid into the SimCell.


Explanation:

The movement of water molecules across a membrane is determined by the concentration of solute particles on each side of the membrane. In this case, the SimCell contains 20 hemoglobin molecules and 480 water molecules, while the extracellular fluid contains 40 dextrose molecules and 960 water molecules. Since dextrose is a solute and water moves from an area of low solute concentration to an area of high solute concentration, more water molecules will flow from the SimCell into the extracellular fluid than from the extracellular fluid into the SimCell.


Learn more about water movement across a permeable membrane here:

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Rewritten by : Barada

Final answer:

More water molecules will flow from the extracellular fluid into the SimCell than from the SimCell into the extracellular fluid, due to the SimCell being hypertonic compared to the surrounding fluid.

Explanation:

Given a SimCell with a water-permeable membrane containing 20 hemoglobin molecules and 480 water molecules, and an extracellular fluid with 40 dextrose molecules and 960 water molecules, the movement of water across the membrane can be predicted using the principles of osmosis. Since water moves by osmosis from the side of the membrane where water concentration is high (low solute concentration) to the side where water concentration is low (high solute concentration), we can determine the direction of water movement.

Inside the SimCell, the concentration of solutes (hemoglobin) is higher (20 solute molecules in 480 water molecules) compared to the concentration of solutes (dextrose) in the extracellular fluid (40 solute molecules in 960 water molecules). This indicates that the SimCell is in a hypertonic state relative to the extracellular fluid, which is hypotonic. Therefore, water molecules will likely flow from the extracellular fluid into the SimCell more than from the SimCell into the extracellular fluid.

The answer to the student's question is: More water molecules will flow from the extracellular fluid into the SimCell than from the SimCell into the extracellular fluid.