Chapter 4 -6

Question 1

What is the function of the plasma membrane?

Answer 1

control activity at the cell’s periphery
intercepts cell signals
controls the flux of molecules and ions

Question 2

Permeability descreases with?

Answer 2

longer FA tails

saturated FA tails

Question 3

What is the structure of the plasma membrane?

Answer 3

The fluid mosaic model

- phospholipid bilayer is main component

Question 4

What helps the phospholipid bilayer form a stable bilayer?

Answer 4

nonpolar/polar regions

Question 5

Phospholipids have?

Answer 5

free lateral movement

Question 6

Fluidity is increased by?

Answer 6

cholesterol (inhibits permeability)

unsaturated FA’s

Question 7

Mosaic?

Answer 7

proteins make the bilayer function

Question 8

What are integral proteins?

Answer 8

Transport proteins
Adhesion ""
Enzymes 
Receptor ""
Recognition ""

Question 9

What doe receptor proteins do?

Answer 9

respond to chemical messages

- a signal binds to a receptor and changes the cells activity

Question 10

Recognition proteins?

Answer 10

major histocompatability molecules