Cell Membrane

Question 1

What is the inner leaflet of the phospholipid bilayer composed of?

Answer 1

Phosphotidylethanolamine
Phosphotidylserine (neg charged)
Phosphotidylinositol (neg charged) (important in cell signaling)

Question 2

Where is cholesterol found and what is it’s purpose?

Answer 2

Located within the phospholipid bilayer.
In high temps- gives cell structure and reduces permeability to small molecules.
In low temps- stops membrane from freezing and maintains fluidity.

Question 3

What is glycocalyx?

Answer 3

Not an integral part of the cell.

Carbohydrates coat the extracellular surface of cell

Question 4

What are lipid rafts?

Answer 4

Landing spots for things the cell wants to invest, has receptors.
Small patches of cholesterol and sphingolipids.

Question 5

What is in the outer leaflet of the phospholipid bilayer.

Answer 5

Phosphatidylcholine
Phosphatidylethanolamine
Sphingomyelin
Glycolipids- create a cell coat involved in cell-cell interactions and conveys antigenicity.