Lipids

Question 1

Myristic

Answer 1

14:0
Carbons:double bond

Question 2

Palmititc

Answer 2

16:0
Carbons:double bond

Question 3

Oleic

Answer 3

18:0
Carbons:double bond

Question 4

Stearic

Answer 4

18:1
Carbons:double bond

Question 5

Arachidic

Answer 5

20:0
Carbons:double bond

Question 6

Arachidonic

Answer 6

20:4
Carbons:double bond

Question 7

Docosahexanoic

Answer 7

22:6
Carbons:double bond

Question 8

Phospholipid/Glycerolphospholipids

Answer 8

-Hydrophobic portion(Non-head portion) = diagylcerol(DAG)
-major components of cell membranes
-composition changes the stability, fluidity, and permeability of cell membranes
-can serve as signaling molecule

Question 9

phosphatidylcholine(PC)

Answer 9

Headgroup: Choline

Characterisitics:
-Zwitterionic
-Charge: 0

Most abundant phospholipid animal and plant membranes

Question 10

phosphatidylethanolamine(PE)

Answer 10

Headgroup: ethanolamine

Characterisitics:
-Zwitterionic
-Small headgroup
-High H-bonding capacity

Major component in cell membranes(Especially bacteria)

Question 11

phosphatidylinositol(PI)

Answer 11

Headgroup: inositiol

Characterisitics:
-Anionic
-bulky headgroup
-can exist as (mono- & poly-)phosphates

Most abundant in cell membranes(Animals)

Major role in signaling and trafficking
-aided by reversible phosphorylation on 3,4,5 positions

Question 12

phosphatidylserine(PS)

Answer 12

Headgroup: Serine

Characteristics:
-anionic
-Charge: 0

Inner leaflet: contributes to non-specific electrostatic interactions
VS.
Outer leaflet: phagocyte signal

Question 13

Sphinogomyelin(SM)

Answer 13

Headgroup: PhosphoCholine

Characterisitics:
-Generally long, saturated fatty acid tails
-Saturated tails allow of taller, narrower lipid than phospholipids of the same chain length(Tighter packing-> adopts “gel” phase)

Mainly found in outer leaflet