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”

4. 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.

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

6. Lipid Functions
Insulation of whales and walruses

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

8. Lipid Functions
Waxy layer of plants, keeps water in

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

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

11. Arrangement of FA in Cell

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

13. Kinds of LIPIDS
Triglycerides
Waxes
Steriods
phospholipds

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

15. TWO categories of triglycerides
Saturated
unsaturated

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

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

18. Steroids