Lipids & Plasma Membranes

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  • Lipids & Plasma Membranes
    • Triglyceride
      • Fats and oils
      • Structure
        • 3 fatty acids
          • Saturated fatty acids = solid at room temperature
          • Unsaturated fats = Liquid at room temperature (oils)
          • Hydrocarbon tails vary according to the fatty acid (R-Group)
          • Joined by an ester bond formed in a condensation reaction
            • Glycerol molecule
              • an alcohol containing 3 carbon atoms linked to hydroxyl
              • General Formula: -(C3H8O3)
        • Glycerol molecule
          • an alcohol containing 3 carbon atoms linked to hydroxyl
          • General Formula: -(C3H8O3)
    • Insoluble in water
      • Soluble in some organic solvents
    • Plasma membrane
      • Made up of proteins and phospholipids
      • "phospholipid bilayer" :- 2 layers of phospholipids embedded with proteins
      • Fluid mosaic model
        • "Fluid" : - because the individual phospholipid molecules can move relative to one another (flexible structure that is constantly changing shape)
        • "mosaic" :- because of the extrinsic & intrinsic proteins that are embedded within it
          • Extrinsic proteins
            • - appear on the surface of the bilayer or partially embedded.
            • - Give mechanical support or act as receptors for hormones
          • Intrinsic proteins
            • Span the complete length of the bilayer from one side to the other
            • - Some act as carriers to transport water soluble materials across the membrane
            • Form ion channels for sodium, potassium etc.
    • Phospholipids
      • Structure
        • Similar to triglyceride
      • Fatty acids (hydrocarbon tails) are hydrophobic
  • Joined by an ester bond formed in a condensation reaction

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