Transport Across the Cell Membrane Worksheet student copy (3)
University: San Jacinto College
Course: Microbiology for Non-Science Majors (BIOL 2320)
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Transport Across the Cell Membrane Name __Gloria Franco_
Study the diagrams below. Note the concentrations of the various solutions. The membrane is
permeable to both water and glucose.
A. Hypertonic B. Hypotonic. C. Isotonic.
1. Draw arrows indicating the net movement of each material.
2. Is the solution in the beaker isotonic, hypertonic or hypotonic to the solution in the bag? Label each
solution under the picture.
3. Are these substances moving across the membrane by active or passive transport? Explain.
Passive transport. An example is water diffusion.
4. Describe how the appearance of the bag at “A” might change after a period of time has passed.
The bag will shrink after time due to the water leaving.
5. Describe how the appearance of the bag at “B”” might change after a period of time has passed.
The bag is going to extend due to the water traveling into the bag.
6. Describe how the appearance of the bag at “C”” might change after a
period of time has passed.
The bag is going to stay the same due to the isotonic solution.
7. What will happen to the movement of water and glucose when both sides of the membrane have
reached equilibrium? The solution will be isotonic at the ‘same strength’.
8. What molecule is largely responsible for the changes in volume of these bags?
The red blood cells in your blood must constantly be in an isotonic condition. A 0.9% salt
solution is isotonic to red blood cells.
9. Draw a simple sketch of a red blood cell in an isotonic solution. Label the inside and the outside of
the cell with the correct concentrations of salt and water. The amount of water going into the cell
is the same as the amount going out of the cell. The salt inside the cell is the same as the
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