Lecture 4: Epithelial Tissues Cell Membrane

Question 1

Cholesterol

Answer 1

Inner and outer leaflet

Question 2

Phosphatidylcholine

Answer 2

Outer leaflet

Question 3

Phosphatidylethanolamine

Answer 3

Inner and outer leaflet

Question 4

Sphingomyelin

Answer 4

Outer leaflet

Question 5

Glycolipid function

Answer 5

Create cell coat involved in cell-cell interactions and convey antigenicity

Question 6

Glycosylphosphatidylinositol

Answer 6

Outer leaflet- important for cell signaling

Question 7

Phosphatidylserine

Answer 7

Inner leaflet, negative charge

Question 8

Phosphatidylinositol

Answer 8

Inner leaflet, negative charge, cell signaling

Question 9

Lipid raft composition

Answer 9

Cholesterol, sphingolipids

Question 10

Lipid rafts compartmentalize cellular processes by acting as organizing centers for:

Answer 10

Assembly of signaling molecules
Influencing membrane fluidity
Membrane protein trafficking
Regulating neurotransmission and receptor trafficking

Question 11

Glycocalyx

Answer 11

Carbohydrate coat on extracellular surface that:
Protects cell from stress
Serves as barrier against microorganisms
Involved in cell-cell interactions

Question 12

Glycolipid location in cell membrane

Answer 12

Outer leaflet with carbohydrate portion facing extracellular environment

Question 13

Fluid mosaic cell membrane model

Answer 13

Developed by singer and nicolson

Model consists of a phospholipid bilayer forming thin oily fluid with associated proteins