Chapter 5 Plasama Membrane Structure And Function

Question 1

List the major components of cell membranes and describe how each of these contribute to membrane function.

Question 2

How does the degree of saturation of phospholipid fatty acid chains affect membrane fluidity?

Question 3

Describe whether each of the following can diffuse through the plasma membrane: 1) small nonpolar molecules such as O2 and CO2, 2) water molecules, 3) glucose 4) ions

Question 4

What are the factors that affect the rate of diffusion?

Question 5

Describe how the tonicity of a solution can affect the movement of water into or out of a cell.

Question 6

Predict which way water will move via osmosis, given the overall solute concentration on either side of a semi-permeable membrane in 1) hypertonic, 2) hypotonic and 3) isotonic solutions (give example of each).

Question 7

What happens to animal and plant cells when they are placed in 1) hypertonic and 2) hypotonic solutions?

Question 8

What is osmolarity?

Question 9

Describe at least three ways in which membrane proteins can help substances cross a cell membrane.

Question 10

What are the different types of membrane proteins?

Question 11

What are the differences between passive transport (diffusion, facilitated diffusion and osmosis) and active transport (give an example of each)?

Question 12

Describe an example of a channel protein, a carrier protein and a transporter pump.