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LIPIDS
• Families of lipids include fats,
phospholipids, and steroids
• These families above
DO NOT mix with water
FATS
• Major function is for energy
storage
• Fat molecules are made up of four parts:
• a molecule of glycerol (on the right) and
• three molecules of fatty acids.
• Glycerol is a 3 carbon alcohol
• Fatty Acids have LONG carbon
skeletons that range in length
Saturated FATS
• Have the maximum number of the hydrogen atoms
at each carbon (no double bonds)
• Most fats present in animals ie. Cows, sheep
• Solid at room temp.
• It contributes to cardiovascular disease since their
structure is “saturated”
Fat continued..
•
Unsaturated FATS
• Have one or more DOUBLE BONDS
• Examples: Plant fats
• Liquid at room temp.
Double Bond
Phospholipids
• Only have 2 fatty acids rather than 3
• The 3rd carbon is attached to a phosphate
group (water loving)
• Heads are hydrophillic (water loving)
• Tails are hydrophobic (water hating)
• Cell membrane is made of 2 layers of
phospholipids
Phospholipid Structure
Steroids
• Made of a CARBON skeleton of 4 fused
rings
• Cholesterol is an important steroid for the
body
• It is the precursor for the production of other
steroids and hormones
• BUT a high concentration of cholesterols
causes ARTHEROSCLEROSIS which can
eventually lead to heart attacks!! Oh No!
Steroids Structure
•
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