9.12.05 - Macromolecules II Lipids Characteristics Contains...

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September 12, 2005 – Macromolecules II Lipids Characteristics: Contains C, H and sometimes O Hydrophobic Function: Energy Storage (Fats and Oils) Structure (phospholidpids) Signal molecules (hormones & streroids) Examples: Fats and Oils o 3 fatty acids (tails) and a glycerol (backbone) o Ester Linkage joins fatty acids to glycerol via dehydration synthesis. Phospholipid o one glycerol, two fatty acids, phosphate, choline (nitrogen and hydrocarbs) o FA is hydrophobic, every thing else, which makes the head, is hydrophilic and polar o This is good for forming membranes (a lipid bilayer) Steroids o Example: cholesterol o Generally a hydrophobic molecule with hydrocarbs. Proteins  Functions o Structure – Collagen (bone), keration (hair) o Motors – Actin & Myosin (muscles) o Enzymes – digestion, biosynthesis o Transporters – hemoglobin transports oxygen o Signal molecules – Insulin (acts like a hormone) o Receptors – rhodopsin (something in eye that controls sesitvity to light o
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