1. Lipids The three types of lipids are fats, oils, and waxes.
Contain carbon, hydrogen, and oxygen
Typically contain two monomers – glycerol and fatty acids
Glycerol contains the hydroxyl (OH) group.
Fatty acids contain the carboxyl (COOH) group.
Emphasize the three types of lipids. Click link for glycerol and fatty acids to show a diagram of the two structures. Use InterWrite tablets to circle the functional group.

2. Monomers in Lipids Lipids
Discuss the differences between the glycerol and the fatty acids chain.
Lipids

3. Functions of Lipids Lipids store energy for later use by the body.
Lipids also serve as padding and protection for the body.
Lipids do not dissolve in water (hydrophobic), but may contain parts that can dissolve in water.
The H : O ratio is higher in lipids than it is in carbohydrates.
Identify the functions of the lipids. Make sure students have the same information on their Cornell note sheet.

4. Structure of a Lipid Dissolves in water (hydrophilic)
Does not dissolve in water (hydrophobic)
Use this slide to discuss the hydrophilic and hydrophobic ends of the lipid molecule. The link will also take you to an image of the phospholipid bilayer.

5. Phospholipid Found in cell membranes Head is the phosphate group.
Hydrophilic
Tails are the fatty acids.
Hydrophobic
Explain to the students how the phosholipid bilayer works.

6. Fatty Acids
Long chains of carbon atoms with attached hydrogen atoms (hydrocarbons)
Saturated fats contain only single bonds between the carbon atoms.
Unsaturated fats contain one or more double or triple bonds between the carbon atoms.
Differentiate between saturated and unsaturated fats.

7. Saturated & Unsaturated Fats
Explain the structure.