Lipids • Highly diverse structures • Unifying property • Hydrophobic: little to no affinity to water • Contains hydrocarbons, which form nonpolar covalent bonds • Do not form polymers • Biologically important lipids containing molecules: – Fats – Phospholipids – Steroids
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Lipids Highly diverse structures Unifying property Hydrophobic: little to no affinity to water Contains hydrocarbons, which form nonpolar covalent bonds.
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Lipids
• Highly diverse structures
• Unifying property• Hydrophobic: little to no affinity to water• Contains hydrocarbons, which form nonpolar covalent bonds
• Do not form polymers
• Biologically important lipids containing molecules:– Fats– Phospholipids– Steroids
Fats
• Structure– Composed of two different molecules bonded by ester linkage
• fatty acid & glycerol
– - Fatty acid
Hydrocarbon chain with a carboxyl group at one end
– Glycerol• Three-carbon alcohol
– Each carbon attached to hydroxyl group
Try to Draw
LE 5-11a
Dehydration reaction in the synthesis of a fat
Glycerol
Fatty acid(palmitic acid)
LE 5-11b
Ester linkage
Fat molecule (triacylglycerol)
• Hydrophobic• H2O molecules form hydrogen bonds with each other and
EXCLUDE fatty acid chains-->Fats separate from H2O (like oil