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8 terms

Chapter 5: Lipids!!

STUDY
PLAY
Lipids
diverse group of organic compounds: grouped together because they are HYDROPHOBIC

insoluble in water

will dissolve in nonpolar solvents

not a true polymer; still a macrolecule
Fats
composed of
glycerol(3-carbon alcohol;each with a hydroxyl group)
fatty acid(contains carboxyl group; long hydrocarbon chain or "tail)
the nonpolar C-H bonds make the chain hydrophobic and insoluble in water
monomer of lipids/fats
tryglyceride
covalent bond that links tryglycerides
ester linkage
functions of fats
energy storage(1g of fat stores 2x as much energy as 1g of catbohydrate)!!

cushions vital organs in mammals(ex: kidney)

insulates against heat loss(ex: whales, seals)
phospholipids
composed of
glycerol
2 fatty acids(hydrophobic)
a phosphate group(hydrophilic)
steroids
composed of
4 fused carbon rings with various functional groups
cholesterol
is preursor to many other steroids(including sex hormones in vertebrates)

common component of cell membranes

can cause atherosclerosis(if have too much)