Construction of the Cell Membrane Worksheet
Directions: Use the website Construction of the Cell Membrane
(http://www.wisc-online.com/lrnobj/ap1/AP1101/framz.html) to answer the
following questions.
1. What is the cell membrane mainly composed of?
Lipids and proteins
2. Cell membranes consist of a double layer of what?
Phospholipids
3. Name the types of molecules in the cell membrane and the three examples of
globular-shaped proteins.
A.Phospholipids
b. Fibrous protein
c.Glycoprotein
d. Pore protein
e. Channel protein
4. What does the cell membrane allow through?
Lipid soluble substances, like oxygen, carbon dioxide, steroids.
5. What do hydrophilic and hydrophobic mean and what parts of the phospholipid
bilayer is which?
Hydrophilic- water soluble-Heads
Hydrophobic water insoluble-Tails
6. Do fibrous proteins span the entire membrane?
Yes, they span the entire membrane and serve as receptors for the cell
7. How do water molecules pass through the membrane?
One type of globular protein forms “pores” to allow lipid insoluble water molecules to pass through.
8. What do channel proteins let through?
ions
9. Do glycoproteins span the entire membrane?
No, because they are peripheral
10. What do animal membranes have that plant membranes do not?
Cholesterol molecules