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Lipids PowerPoint Presentation

Lipids

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Lipids

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  1. Lipids

  2. Lipids are composed of: • Carbon • Hydrogen • Oxygen BUT: Lipid molecules have a larger number of Carbon and Hydrogen and a smaller number of Oxygen than Carbohydrates “CHO”

  3. Properties of Lipids • Fats, oils, and waxes are lipids. • Unlike the other organic compounds, lipids do not dissolve in water; therefore, they are nonpolar or insoluble.

  4. Lipid Functions • Lipid molecules provide a barrier b/t a cell and its watery environment

  5. Lipid Functions • Insulation of whales and walruses

  6. Lipid Functions • Skin oils help repel water from feathers of ducks

  7. Lipid Functions • Waxy layer of plants, keeps water in

  8. Fatty Acids • Lipids are composed of building blocks or MONOMERS called Fatty Acids.

  9. Fatty Acids • Carboxyl end (-COOH) • polar • Hydrophilic: “water loving” • Hydrocarbon end (CH3) • Non-polar • Hydrophobic: “Water fearing” WATER

  10. Arrangement of FA in Cell

  11. Functions of Lipids • Store Energy!! • Fats have more H bonds than Carbs and can store more energy.

  12. Kinds of LIPIDS • Triglycerides • Waxes • Steriods • phospholipds

  13. Triglycerides Composed of: • 1 glycerol molecule • 3 molecules of fatty acids

  14. TWO categories of triglycerides • Saturated • unsaturated

  15. Waxes • Plant waxes • Forms protective coating on outer surface • Earwax • Prevents bacteria from entering middle ear

  16. Steroids • Composed of 4 carbon rings • Found : • Hormones • Toad venom • Plant poisons • Chlorophyll • Cholesterol

  17. Steroids