Cell Membrane Review Questions
Name___________________
1. Describe the cell membrane in terms of its molecular structure.
2. Give three functions of the cell membrane.
3. What is passive transport? What three kinds of passive transport were discussed
in class?
4. What is diffusion?
5.
In what direction does diffusion occur?
6. What is osmosis?
7.
The direction water moves across a cell membrane depends on the concentration
of what on either side of the cell membrane?
8.
Explain what is true about solutes if the outside of the cell is hypotonic to the
cytosol. Which way does water move? Draw it.
9.
Explain the solute conditions if the outside is hypertonic to the cytosol. Which
way does water move? Draw it.
10. What does the phrase “down the concentration gradient” mean?
11. What does the phrase “against the concentration gradient” mean?
12. What are the two parts of any solution?
13. Define the following terms:
a. hypertonic solution:
b. hypotonic solution:
c. isotonic solution:
14. Given a red blood cell, what will happen when it is placed in a hypertonic
solution?
15. Given a red blood cell, what will happen if it is put into a hypotonic solution?
16. Given a red blood cell, what will happen if it is put into an isotonic solution?
17. What 2 factors might influence the rate of diffusion across a membrane?
18. Describe the process of facilitated diffusion.
19. What sugar moves across the cell membrane by facilitated diffusion?
20. What is active transport?
21. Name and describe the types of active transport discussed in class.
22. How do facilitated diffusion and active transport differ?
23. Define endocytosis:
24. Define exocytosis:
25. Can endocytosis and exocytosis occur with the same cell? Explain.
26. Do molecules stop moving when equilibrium is reached? Explain.
27. What structure around the outside of plant cells keeps them from rupturing from
too much water?
28. What is turgor pressure and how does it help plant cells?
29. What happens to plant cells placed in a hypertonic solution? Name this process.
30. What is cytolysis and what causes it?
31. How do phagocytes protect cells?
32. Given a cell with a 1% oxygen solution (99% water) placed in an environment,
which is 3% oxygen. Determine the hypotonic solution, hypertonic solution, and
predict the direction of osmosis and diffusion. At what concentration will
equilibrium be established? Draw it to help explain your answer.