Testing Your Knowledge

1. Why don't all cells of a multicellular organism have the same pattern of surface features?

2. Cite an illustration of how the cell membrane is a dynamic rather than a static structure.

3. List three ways that cells maintain their shape in the face of changing extracellular solute concentrations.

4. Endocytosis provides a general route for a substance to enter a cell. How can this process be more selective?

5. What are the functions of the following proteins:

6. Describe the structure and components of a plant cell wall.

7. Why is a cell wall not simply a static box?

8. What symptoms might result in a person lacking a type of integrin?