Pre-mat Lipids

Question 1

Lipid

Answer 1

any non-polar substance containing repeated methylene groups that is nearly or totally insoluble in water, but is soluble in other non-polar solvents

Question 2

storage lipids (neutrals)

Answer 2

triacylglycerols: glycerol, 3 FA tails

ester linkage to glycerol, stored in cells for energy reserve

form large spherical fat droplets in the cell cytoplasm

Question 3

Membrane lipids (polar)

Answer 3

1. Phospholipids:
   - 1.1 Glycerophospholipids: glycerol, 2 FA, 1 PO4, 1 alcohol
   - 1.2 Sphingolipids: spingosine, 1 FA, 1 PO4, choline
2. Glycolipids:
   - 2.1 Sphingolipids: sphingosine, FA, mono or oligosaccaride

All polar will form self-sealing lipid bilayers

Question 4

ceramide

Answer 4

fatty acid + sphingosine

if add phosphate and choline: sphingophospholipid
if add saccaride: sphingoglycolipid

Question 5

derived lipids

Answer 5

polyisoprenoids: dolichol
eicosanoids
lipid-soluble vitamins: A, E, b-carotene, D2, K1, erosterol

Question 6

cholesterol role in membrane

Answer 6

regulates fluidity

decreases fluidity/permeability because of rigid planar steroid ring structure