5 3 Major Roles of Lipids: #1: Used as long-term energy storage. Adipose cells: (fat cells) store energy, cushion vital organs, and insulate the body.
6 Many organisms can survive w/o steady diets because of stored fat. Fats store energy more efficiently than carbs. (They have more H bonds!)Many organisms can survive w/o steady diets because of stored fat.When there’s lots of food, animals convert excess food into fats.When food is scarce, these can be broken down for energy.
7 #2: Form biological membranes & control water movement. Cell membranes are made up of phospholipids. One end likes water, one end is repelled by water.Waxy surface on plants controls water loss.
8 #3: Used as chemical messengers. Ex. Steroids (testosterone & estrogen)Testosterone
9 MONOMERS Lipids are made up of fatty acids Fatty Acids - long chains of C & H atoms that have a carboxyl group (-COOH) at one end.- polar- hydrophilic “water loving”Have a hydrocarbon group at the other end (CH3)NonpolarHydrophobic
10 Saturated Fats= All C atoms are bonded by a single bond, holding the max number of H atoms. Commonly found in dairy products and meats.
11 Unsaturated Fats = A pair of carbon atoms is joined by a double bond, it doesn’t contain the max number of H atoms.Changes the shape, by adding a “kink”