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Testing Your Knowledge
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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:

  • a. tubulin
  • b. dynein
  • c. actin
  • d. myosin
  • 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?

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