Biology 1 Lipids Composed of Carbon, Hydrogen, and Oxygen. Have a higher ratio of carbon and hydrogen to oxygen compared to carbohydrates. This means they store more energy per gram
Biology 1 2003- 2004 Lipids Function: energy storage very concentrated twice the energy as carbohydrates! cell membrane cushions organs insulates body think whale blubber!
Biology 1 Lipids Lipids are NONPOLAR They do not mix with water Ex: oil and water
Biology 1 Fatty Acids Unbranched carbon chains that make up most lipids Long carbon chain with a carboxyl group (-COOH) attached at one end
Biology 1 Lipids Three classes of lipids that contain fatty acids: Triglycerides Phospholipids Waxes
Biology 1 Triglyceride 3 fatty acids attached to a molecule of glycerol
Biology 1 Phospholipids Have 2 fatty acids attached to a molecule of glycerol. Cell membranes are made from phospholipids heads are on the outside touching water “hydrophillic” tails are on inside away from water “hydrophobic” forms a barrier between the cell & the outside
Biology 1 Waxes Type of structural lipids consisting of a long fatty acid chain joined with a long alcohol chain. Waterproof Form protective cover on outside of plants Used as protective layer in animals Earwax-helps microorganisms for entering ear canal.
Biology 1 Steroids No fatty acids Four fused carbon rings with various functional groups Testosterone and estrogen Cholesterol- needed for nerve cells and other functions Too much cholesterol may lead to blockage and heart disease.