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This question is the "Test Your Understanding" question from the osmosis Red Blood Cell demonstration in your Simbio module for the week.

You create a SimCell with a flexible, water-permeable membrane that contains 100 molecules of hemoglobin, 100 molecules of dextrose, 100 molecules of glucose, and 9,700 molecules of water. Which of the following extracellular solutions will not cause the SimCell to expand or shrink greatly?

A. A solution that is 1.5% dextrose, 1.5% glucose, and 97% water
B. A solution that contains 500 molecules of dextrose and 9,500 molecules of water
C. Pure water

Answer :

Final answer:

The process of osmosis in biology describes movements of water in response to solute concentrations. To avoid significant shrinkage or expansion of a 'SimCell', the concentrations inside and outside the cell need to be isotonic. The best option provided fitting this criterion is the solution with 1.5% dextrose, 1.5% glucose, and 97% water.

Explanation:

The question pertains to the biological concept of osmosis, which involves water movement based on the concentration of solutes. In a flexible, water-permeable cell, water will flow into or out of the cell depending on the concentration of solutes inside versus outside the cell. If the concentration of solutes outside the cell is equal to the concentration inside the cell, the cell will not shrink or expand greatly because water will flow in and out at roughly equal rates. This condition is described as an isotonic environment.

For a 'SimCell' to not shrink or expand significantly, the ideal solution would maintain similar concentration levels of the listed substances: hemoglobin, dextrose, glucose, and water. Therefore, option (a), a solution that is 1.5% dextrose, 1.5% glucose, and 97% water, is the best option among the choices provided. This solution mirrors the percentages in the cell, keeping the intracellular and extracellular environments 'isotonic' and preventing drastic changes in cell volume.

Learn more about osmosis here:

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Rewritten by : Barada

Final answer:

None of the given solutions is isotonic to the SimCell, meaning all would cause it to either shrink or expand. This is due to the difference between the solute concentration within the cell and the extracellular solution.

Explanation:

Osmosis is the movement of water across a semi-permeable membrane from an area of low solute concentration to an area of high solute concentration. In the Simbio module, you created a SimCell with certain amounts of hemoglobin, dextrose, glucose, and water. This cell will expand or shrink based on the extracellular solution. The concept to understand here is isotonicity. An isotonic solution is a solution in which the concentration of solutes equals the concentration inside the cell which means the cell will not shrink or expand.

Let's consider the solutions provided:

  • a. The solution is 1.5% dextrose, 1.5% glucose, and 97% water, but the concentration of solutes in the cell is 1% for each solute and 97% water, therefore, this solution would cause the cell to shrink due to the higher concentration of solutes outside of the cell.
  • b. Here there's a high concentration of dextrose (500 molecules) compared to the cell (100 molecules) making this a hypertonic solution, again causing the cell to shrink.
  • c. The cell placed in pure water, would cause water to rush into the cell due to osmosis (low to high concentration) causing the cell to expand.

We can conclude that none of the provided solutions are isotonic with the cell which means all would cause the cell to either shrink or expand.

Learn more about Osmosis and Isotonicity here:

https://brainly.com/question/11789335

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