Lipids

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  • Lipids
  • store energy
  • form cell membranes
  • transmit chemical messages
  • hydrophobic
  • made of carbon + hydrogen
  • include: fats, oils, waxes, phospolipids +  steroids
  • organic molecules
  • don't mix with water to form a solution
  • hydrocarbons
  • tail non polar
    • long tail of molecules has no charge
  • head polar
    • attracted to polar molecules in water
  • attracted to polar molecules in water
  • fats + oils
    • energy storage  lipids
    • fat is lighter than carbs + has twice as much chemical energy
    • store their energy in C + H bonds
    • triglycerides
      • small glycerol molecules + 3 small fatty acid
        • fatty acids : long chain of C + H
    • fats are solid at room temp. oils are liquid at room temp.
  • saturated fats
    • single bond between C atoms
    • sound in animals we eat
    • if eaten too much, may lead to heart disease
  • unsaturated fats
    • double bonds between C atoms
    • found in plants we eat
  • Phospholipids
    • form cell membranes
    • help maintain homeostasis
    • contain 2 small fatty acids (similar to fats)
    • has a structure called phosphate groups
      • gives the  phospholipid a  negative charge making it hydrophilic
  • steroids
    • chemical messengers
    • carbon rings
  • waxes
    • repel water
    • hydrophobic

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