phospholipid Bilayer And Cell Surface Membrane Components

Question 1

What are two ways proteins are embedded into the phospholipid bilayer

Answer 1

-Extrinsic / periphal proteins
-intrinsic / integron protein

Question 2

What is a extrinsic / peripheral protein

Answer 2

Don’t extend completely across membrane

Question 3

What is an intrinsic / integron protein

Answer 3

Span the entirety of the phospholipid bilayer

Question 4

Channel protein

Answer 4

-Intrinsic
-allows water soluble ions to diffuse across

Question 5

Carrier proteins

Answer 5

-Change shape in order to move molecules across

Question 6

Describe Glyco proteins on the phospholipid bilayer

Answer 6

-recognition site
-carbohydrate attached to a protein

Question 7

Describe glycolipid on the phospholipid bilayer

Answer 7

-Carbohydrate covalently bonded to phospholipid
-Act as a cell service receptor for specific chemicals
-Helps maintain stability of the membrane

Question 8

Describe cholesterol on the phospholipid bilayer

Answer 8

-Strengthens membranes by sitting between fatty acid tails which makes the barrier more complete
-hydrophobic
-Limits movement of phospholipid

Question 9

Describe the structure of the phospholipid bilayer

Answer 9

Each phospholipid has a hydrophilic head and hydrophobic tail. The phospholipids do not lie side-by-side, but the glycerol backbone lays to one side. This allows diffusion of small nonpolar lipid soluble molecules to diffuse through.

Question 10

What is the fluid mosaic model?

Answer 10

Mixture of components with lateral fluid movement of phospholipid, protein, glycoprotein, glycolipid, and cholesterol