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Lipids 2003-2004 Lipids Examples fats oils waxes hormones steroids sex hormones testosterone (male) estrogen (female) 2003-2004 Lipids Function: energy storage Supplies more energy than carbohydrates: 1 g. fat = 9cal 1 g. carb = 4 cal structure of cell membrane sex hormones cushions organs insulates body think whale blubber! 2003-2004 Structure of Fat not a chain (polymer) = just a “big fat molecule” 2003-2004 Fats: Produced by dehydration synthesis * Fats are made with 1 Glycerol molecule and 3 Fatty Acid molecules Glycerol and fatty acids contain… CARBON, HYDROGEN, and OXYGEN 5 FATScan be classified as saturated or unsaturated 6 Saturated fats Most animal fatsbutter, meat fat solid at room temperature Limit the amount in your diet contributes to heart disease deposits in arteries 2003-2004 Unsaturated fats Plant, vegetable, nuts & cold water fish fats (oils) liquid at room temperature Better choice in your diet 2003-2004 Saturated vs. unsaturated saturated unsaturated 2003-2004 Other lipids in biology Cholesterol good molecule in cell membranes make hormones from it including sex hormones but too much cholesterol in blood may lead to heart disease 2003-2004 Other lipids in biology Cell membranes are made out of lipids phospholipids heads are on the outside touching water “like” water tails are on inside away from water “scared” of water forms a barrier between the cell & the outside 2003-2004