1. Biochemistry Part V Lipids

2. Lipids A class of organic molecules that are insoluble in water A class of organic molecules that are insoluble in water There are 3 major groups of lipids There are 3 major groups of lipids Triglycerides Triglycerides Phospholipids Phospholipids Steroids Steroids

3. Triglycerides Include fats, oils, and waxes Include fats, oils, and waxes Consist of 3 fatty acids attached to a glycerol molecule Consist of 3 fatty acids attached to a glycerol molecule Hydrocarbons with a Hydrocarbons with a carboxyl group (-COOH) at one end of the chain

4. (Saturated)

5. Monounsaturated Polyunsaturated

6. Phospholipids Looks just like a lipid except that one of the fatty acid chains is replaced by a phosphate group (-PO 3 2- ) Looks just like a lipid except that one of the fatty acid chains is replaced by a phosphate group (-PO 3 2- ) An additional chemical group (R) might also be attached An additional chemical group (R) might also be attached Amphipathic Amphipathic Hydrophilic heads (phosphates) Hydrophilic heads (phosphates) Hydrophobic tails (lipids) Hydrophobic tails (lipids) Provide the foundation for cell membranes Provide the foundation for cell membranes

9. Steroids Characterized by a backbone of 4 linked carbon rings Characterized by a backbone of 4 linked carbon rings Examples: Examples: Cholesterol Cholesterol Some Hormones Some Hormones Testosterone Testosterone Estrogen Estrogen

11. Illegal Steroids????

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