Lipids mindmap-spaces left for molecules of diagrams :)

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  • Lipids
    • Purpose: energy store; protection; insulation; source of energy; phospholipids in membranes; cholesterol in membranes; and hormones.
    • A lipid is a group of organic compounds whose molecules contain atoms of carbon, hydrogen and oxygen only.
      • Much more hydrogen than carbohydrates
      • Some lipids produced by body, some taken in by diet-essential.
      • Non-polar
    • Glycerol
      • Soluble in water; produces triglycerides; polar OH group allows it to be soluble.
    • Fatty Acids
      • Acid group remains the same in all. Made up of acid group and hydrocarbon chain. Chain can vary in length from 2 to 20 carbons.
    • Saturated Fats
      • All possible bonds made with hydrogen; all single bonds except acid group; excess is bad for health; usually animal fats.
    • Unsaturated Fats
      • Not all hydrogen bonds formed leading to some double bonds; monounsaturated=one double bond; polyunsaturated=two or more double bonds; plants are main source (and fish)
    • Triglycerides
      • Formed when 3 fatty acids are attached to one molecule of glycerol; condensation; three water molecules released; ester bonds produced.


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