This exercise introduces the dynamic complexes of proteins, carbohydrates, and lipids that comprise cell membranes. You should learn that membranes are fluid, with components that move, change, and perform vital physiological roles as they allow cells to communicate with each other and their environment. We also show that membranes also are important for regulating ion and molecular traffic flow between cells,and that defects in membrane components lead to many significant diseases.

Instructions: The following problems have multiple choice answers. Correct answers are reinforced with a brief explanation. Incorrect answers are linked to tutorials to help solve the problem.

Overview:

1. Membrane components

2. Lipids and aqueous barriers

3. Hydrophobic forces

4. Osmosis

5. Membrane transport

6. Membrane proteins

7. Diffusion

8. Cotransport

9. Water flow solution

10. Membrane stability

11. Phospholipids

12. Penetrating lipid bilayer

13. Cell junctions

14. Energy requirements for transport

15. Oral rehydration

16. Membrane flow

This resource is part of the Biology Links for One Laptop Per Child course which contains units on Exploring Life; The Cell; Genetics; Mechanisms of Evolution; The Evolutionary History of Biological Diversity; Plant Form and Function; Animal Form and Function; Ecology; and Astrobiology.

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