Download Chapter 8 Questions

Chapter 8 Questions
Vocabulary: phospholipid, lipid bilayer, equilibrium, concentration gradient, diffusion,
carrier protein, osmosis, sodium-potassium pump, signal, receptor protein, second
messenger, isotonic, hypotonic, hypertonic, active transport, passive transport, facilitated
diffusion
1. Relate the functions of the cell membrane to homeostasis.
2. Describe the types of substanes that can pass through the lipid bilayer of the cell
membrane.
3. Outline four functions of proteins within the cell membrane.
4. What would happen if the cell membrane were fully permeable to all substances in
the cell’s environment?
5. Why can’t ions pass through the cell membrane?
6. Why does oxygen diffuse into the cell?
7. Compare the functions of channel proteins and carrier proteins in facilitated
diffusion.
8. Explain why the presence of dissolved particles on one side of a membrane results
in diffusion of water across the membrane.
9. List two ways that a cell can move a substance against its concentration gradient.
10. Based on what you have learned about homeostasis and osmosis, why should
humans avoid drinking sea water?
11. Identify one function of signal molecules in a multicellular organism.
12. Describe the relationship between receptor proteins and signal molecules.
13. List three ways that a receptor protein may respond when a signal molecule binds
to it.
14. Why do you think there are many forms of communication between body cells?
15. Why do you think specificity between a receptor protein and a signal molecule is
important?
16. Distinguish between diffusion and osmosis.
17. Explain why the cell needs a selectively permeable membrane.
18. Describe the structure of the lipid bilayer of the cell membrane.
19. Contrast the action of carrier proteins in facilitated diffusion and active transport.
Some Chapter 7 Review:
20. What is the limiting factor which determine how big a cell can become?
21. Fill in the following table:
Side Length
Surface Area to Volume Ratio
Surface Area
Volume
SA/V Ratio
1mm
2mm
4mm
22. What does the prefix ‘cyto’ mean? What three words in this chapter have this prefix
in them?
23. Use the following three words in the same sentence: prokaryote, eukaryote,
nucleus.
24. Describe two observations of early scientists that support cell theory.
25. Describe how the structure of membranes in chloroplasts and mitochondria
contributes to the function of these organelles.