1. Lipids A lipid is any molecule that DOES NOT mix with water. – They are “water fearing” / nonpolar (hydrophobic) Lipids function in: – Energy (E) storage – and as chemical messengers (e.g., hormones) – forming cell membranes Made up mostly of Carbon and Hydrogen (with a few Oxygen)

2. Lipids 1.Fats (Triglycerides) –M–Monomers: Glycerol + 3 Fatty Acids –N–No double bonds: saturated (solid) –D–Double bonds: unsaturated (liquid) OH Ester Bonds

4. Lipids OH O Testosterone HO O Estrogen Sterols Lipids whose Carbon Skeleton consists of 4 fused rings Includes: Hormones Cholesterol Cortisol Makes up cell membranes HO OH O O

5. Phospholipids Monomers: Glycerol with Phosphate Head + 2 Fatty Acid Chains Amphiphilic (“Both” “lover”) Hydrophilic head Hydrophobic tail Forms 2 layers in water Makes up cell membranes Lipids Phosphate Glycerol Fatty Acids