Chapter 5

How does the plasma membrane act as a selectively permeable membrane?

Sketch the configuration that 10 phospholipid molecules would assume if placed in water. Explain why they arrange themselves this way.

How do some membrane proteins act as both receptors and ion channels?

Define diffusion and osmosis. Explain how osmosis helps plant leaves remain firm. What is the term for water pressure inside plant cells?

Define hypotonic, hypertonic, and isotonic. What would be the fate of an animal cell immersed in each of these three types of solution?

Describe the following types of transport processes in cells. simple diffusion, facilitated diffusion, active transport pinocytosis, receptor- mediated endocytosis, phagocytosis and exocytosis

Name the protein that allows facilitated diffusion of water. What experiment demonstrated the function of this protein?

Imagine a container of glucose solution, divided into two compartments (A and B) by a membrane that is permeable to both water and glucose. If some glucose is added to compartment A, how will the contents of compartment B change? Explain.

How do aquaporins affect the rate of osmosis?