Name : ______

Date: ______

The Cell Membrane : Review #1

Cell Membrane Structure and Function (Learning Outcomes G1-G3)

Read pp. 68- 73

L.O. G – 1 Fluid Mosaic Model

___ 1 Explain why the present theory of cell membrane structure is called the "FLUID

MOSAIC" model?

____2. Describe the difference between an integral protein and a peripheral protein.

___ 3. What is the difference between a glycoprotein and a glycolipid?

___ 4. What is the collective function of all the carbohydrate chains (Glycocalyx) on

the surface of the cell membrane?

___ 5. Use CRERC to describe the 5 major roles of membrane proteins

____6. What role does cholesterol play in the cell membrane?

L.O. G – 2 Selectively Permeable

___ 1. Why is the cell membrane described as being selectively permeable rather than

semi-permeable?

____2. In general methods of transport across the cell membrane can be classified as

being either "Passive" or as being "Active". What is the key difference between

these two categories of transport?

____3. List three specific types of passive transport.

____4. Besides a concentration gradient, what else is required for Facilitated Transport.

____5. Name at least 3 key molecules that can DIFFUSE across the cell membrane. See

Table 4.1 on p.70

L.O. G – 3 Diffusion and Osmosis

___ 1. What does the "Law of Diffusion" state?

___ 2. Would diffusion occur more quickly in liquids or in gases, explain why?

____3. Give the definition for each: a) Solvent b) Solute

___ 4. What is meant by a "concentration gradient"?

___ 5. Many water molecules struggle to pass through the hydrophobic region of the cell membrane, what will allow many of the molecules to slip through? –Think CRERC

___ 6. Define osmosis.

___ 7. How are diffusion and osmosis similar, and how do they differ?

___ 8. Pressure caused by the concentration gradient between two different solutions is

called ______pressure.

___ 9. Name the three types of solutions that cells can be placed into.

OVER --> OVER -->

___10. What will happen to an ANIMAL cell when it is placed into the following:

A) Hypotonic Solution B) Hypertonic Solution

___11. What will happen to an ANIMAL cell when it is placed into the following:

A) Hypotonic Solution B) Hypertonic Solution

PRACTICE QUIZ