Lipids Lipids are composed of Carbon Hydrogen Oxygen

Lipids

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

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

Lipid Functions • Insulation of whales and walruses

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

Lipid Functions • Waxy layer of plants, keeps water in

Fatty Acids • Lipids are composed of building blocks or MONOMERS called Fatty Acids. Pink/Red Yellow

Fatty Acids • Carboxyl end (-COOH) – polar – Hydrophilic: “water loving” – Hydrocarbon end (CH 3) • Non-polar • Hydrophobic: “Water fearing” WATER

Arrangement of FA in Cell

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

Kinds of LIPIDS 1. Triglycerides 2. Waxes 3. Steroids 4. phospholipids

Triglycerides Composed of: 1. 1 glycerol molecule 2. 3 molecules of fatty acids

TWO categories of triglycerides 1. Saturated 2. unsaturated

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

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

THE END