Chapter 13 - The Cell Membrane

Question 1

What is the cell membrane primarily made of?

Answer 1

A double layer of lipid known as the phospholipid bilayer.

Question 2

What is embedded in the cell membrane?

Answer 2

Proteins

Question 3

Is the cell membrane:
A.) permeable
B.) impermeable
C.) semi-permeable

Answer 3

Semi-permeable

Question 4

Some molecules are small enough to pass through the cell membrane. Name 3.

Answer 4

1. Oxygen (O2)
2. Carbon dioxide (CO2)
3. Water (H20)

Question 5

Besides the three small molecules that can pass freely across the membrane, what else can pass through the phospholipid bilayer?

Answer 5

Lipids.

Question 6

The passage of which molecules is heavily regulated?

Answer 6

Larger molecules such as sugars and amino acids

Question 7

What are the functions of the different proteins found in the cell membrane?

Answer 7

1. As receptors for signalling molecules such as hormones
2. As channels and transport proteins to allow substances to pass through the membrane
3. Bonding other cells to hold a tissue together