Download Cell membrane wksht

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Cell Membrane Worksheet
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Goal: The plasma membrane is what separates the internal contents of the cell with the
environment. You will need to understand how important substances move into or out of the cell.
1. What are the three principle functions of the plasma membrane? (3 marks)
2. Name the five types of proteins found in the plasma membrane and provide their
function. (5 marks)
3. Compare and contrast diffusion and osmosis. (3 marks)
4. What is meant by the term tugor pressure? (1 mark)
5. Considering the movement of molecules across the cell membrane;

Contrast the manner in which alcohol and water enter the cell. (2 marks)

Contrast the manner in which amino acids and proteins enter the cell. (2 marks)
6. As a demonstration, an artificial cell consisting of an aqueous solution enclosed in a
semi permeable membrane is placed into a beaker containing a different solution. The
membrane is permeable to water and to monosaccharide’s glucose and fructose but
completely impermeable to the disaccharide sucrose. The concentration of each cell is
described in the diagram below.
0.03M Sucrose
0.02M Glucose
0.01M Sucrose
0.01M Glucose
0.01M Fructose
a. Which solute(s) will exhibit a net diffusion into the cell? Explain. (2 marks)
b. Which solute(s) will exhibit a net diffusion out of the cell? Explain. (2 marks)
c. Which solution is hypertonic, the cell or the solution? Explain. (2 marks)
d. In which direction will there be a net osmotic movement of water? Explain. (2 marks)
7. An infant is brought into a doctor’s office with chronic diarrhea. The mother indicates
the infant has explosive diarrhea whenever she has milk or milk products. The doctor
diagnoses lactose intolerance which means the infant cannot digest milk sugar and
suggests giving lactase prior to feeding the infant milk or milk products.
a. Explain how lactose intolerance leads to diarrhea. (2 marks)
b. How does the addition of lactase prevent diarrhea? (2 marks)