DLA - Cellular Organization

Question 1

By weight, which two macromolecules make up most of the plasma membrane?

Answer 1

1. Lipids ~50%

2. Proteins ~50%

Question 2

What are the three major classes of lipids?

Answer 2

1. Phospholipids
2. Glycolipids
3. Cholesterol

Question 3

Name the five major phospholipids.

Answer 3

1. sphingomyelin
2. phosphatidylserine
3. phosphatidylcholine
4. phosphatidylethanolamine
5. phosphatidylinositol

Question 4

What are two major classes of integral proteins?

Answer 4

1. channels

2. pumps

Question 5

What is the glycocalyx?

Answer 5

Carbohydrate rich zone on the cell

surface that contains glycolipids, glycoproteins, and proteoglycans

Question 6

Which phospholipids are found on the outer leaflet?

Answer 6

phosphatidylcholine and sphingomyelin

Question 7

Which phospholipids localizes to the inner leaflet only to be transferred to the outer leaflet to signal cell death?

Answer 7

phosphatidylserine

Question 8

What are the two major functions of lipid rafts?

Answer 8

signal transduction and endocytosis