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Understanding Lipids: Triglycerides, Phospholipids, and Steroids in Biochemistry

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Learn about the three major groups of lipids - triglycerides, phospholipids, and steroids - and their structures and functions in biochemistry. Explore the properties of each lipid type and their roles in biological processes like cell membranes. Click the link for an educational animation!

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Understanding Lipids: Triglycerides, Phospholipids, and Steroids in Biochemistry

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  1. Biochemistry Part V Lipids

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

  3. Triglycerides • Include fats, oils, and waxes • Consist of 3 fatty acids attached to a glycerol molecule • 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 (-PO32-) • An additional chemical group (R) might also be attached • Amphipathic • Hydrophilic heads (phosphates) • Hydrophobic tails (lipids) • Provide the foundation for cell membranes

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

  8. Illegal Steroids????

  9. Website Animation • http://www.wisc-online.com/objects/index_tj.asp?objid=AP13204

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