UNIT 4 EXAM REVIEW
**Answer questions on a separate sheet of paper
Cell Membrane (3.3 Pg. 81-84)
1. How many layers of phospholipids make up the cell membrane?
2. Explain the term “semi-permeable” and explain why this term is used to describe
the cell membrane
3. Explain the term “fluid mosaic model.”
4. Sketch a section of the cell membrane. Label the following: phospholipids,
integral/channel protein, peripheral/receptor protein, glycoprotein, and cholesterol
5. What is the purpose of glycoproteins in the cell membrane?
6. Explain why cells need channel proteins in their cell membrane
7. What role does cholesterol play in the cell membrane?
8. Explain how the cell membrane helps a cell maintain homeostasis
Cell Transport (3.4 & 3.5 Pg 85-91)
1. Draw a cell in a hypertonic solution. Explain what happens to the cell and why.
Which egg was in a hypertonic solution?
2. Draw a cell in a hypotonic solution. Explain what happens to the cell and why.
Which egg was in a hypotonic solution? How do you know?
3. Draw a cell in an isotonic solution. Explain what happens to the cell and why.
4. Explain the meaning of the phrase “dynamic equilibrium”
5. Define diffusion and provide and example
6. Define osmosis and provide a real life example
7. Give two examples of passive transport
8. How does the sodium-potassium pump work in active transport
9. What is facilitated diffusion? How does it work?
10. Explain how active transport differs from passive transport
11. Compare and contrast exocytosis and endocytosis
12. What is phagocytosis
13. What is a receptor? How does it work? What does it bind to?
14. How do intracellular receptors differ from membrane receptors? What is their
main goal?
**Review the cell organelles and their functions
Biological Organization
1. What are the 14 levels of biological organization in order from simplest to most
complex?
WHEN STUDYING FOR THIS TEST YOU SHOULD REVIEW
All notes from class (outlines)
Vocabulary
Notes and PowerPoints on Miss Lewis’ website
Homework assignments
Textbook chapters (chapter 3)