Ch.4 Bio

Chapter 4—Membrane Structure & Function Reading Comprehension Questions

1. What is the main function of the plasma membrane?

2. Describe the structure of the plasma membrane.

3. What role does cholesterol play in the structure of the cell membrane?

4. Compare and contrast peripheral and integral proteins.

5. Describe the fluid-mosaic model.

6. Describe glycolipids and glycoproteins.

7. Describe the main function of each protein: channel proteins, carrier proteins, cell recognition proteins, receptor proteins and enzymatic proteins.

8. Explain why a membrane is selectively permeable.

9. What are the 2 parts of a solution?

10. Name the factors that influence the rate of diffusion.

11. What is osmotic pressure?

12. The diffusion of water across a membrane is called ____________________.

13. Define crenation.

14. Define facilitated transport.

15. Diffusion, osmosis, and facilitated transport do not require ___________________.

16. Describe the sodium-potassium pump.

17. Larger molecules can exit and enter a membrane by _________________ and _________________________.

18. What is phagocytosis?

19. What is pinocytosis?

20. Compare and contrast diffusion and facilitated transport.

21. Explain the movement of water between hypotonic and hypertonic environments.

22. Describe the differences between facilitated and active transport.

23. Describe the extracellular matrix and explain the role of the extracellular matrix in animal cells.

24. Describe the structure and function of adhesion, tight, and gap junctions.