Lipid Composition and Structural Organization

Question 1

Interactions holding together lipid bilayer:

Answer 1

Van der Waal & hydrophobic

Question 2

3 Classes of Lipids

Answer 2

Phosphoglycerides, Sphingolipids, & Cholesterol (Sterol)

Question 3

Phosphoglyceride

Answer 3

hydrophobic tail, glycerol-3-phosphate, & polar head group

Question 4

Sphingolipid

Answer 4

made up of sphingosine, fatty acyl chain, amino alcohol, & polar head group

Question 5

Cholesterol/Sterol

Answer 5

ring structure with hydroxyl head group

Question 6

Factors affecting bilayer fluidity:

Answer 6

lipid composition, structure of tails (shorter tails/double bonds=increased fluidity), temperature, cholesterol content (inhibits fluidity)

Question 7

Site of phosphoglyceride synthesis

Answer 7

cytosolic side of endoplasmic reticulum

Question 8

Site of Sphingolipid synthesis

Answer 8

exoplasmic face (luminal side) of Golgi complex

Question 9

Lipids abundant in membrane outer leaflet

Answer 9

sphingomyelin & phosphatidylcholine

Question 10

Lipids abundant in membrane inner leaflet

Answer 10

phosphatidylethanolamine, phosphatidylserine, & phosphatidylinositol

Question 11

Lipids evenly distributed between membrane leaflets

Answer 11

cholesterol

Question 12

Flippase

Answer 12

enzyme that can move certain phospholipids from one leaflet to the other; ATP dependent