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Lesson 7d: Lipids (Fats & Oils) Lipids Concentrated energy molecules Regents Biology Lipids Examples fats oils waxes hormones sex hormones testosterone (male) estrogen (female) Lipids Function: energy storage very concentrated twice the energy as carbohydrates! cell membrane cushions organs insulates body think whale blubber! Molecular Structure of Fat not a chain (polymer) = just a “big fat molecule” 1 double bond = unsaturated More than 1 double bond = polyunsaturated Saturated vs. unsaturated saturated unsaturated Double Bond! Saturated fats Most animal fats solid at room temperature Limit the amount in your diet contributes to heart disease deposits in arteries Unsaturated fats Plant, vegetable & fish fats liquid at room temperature the fat molecules don’t stack tightly together Better choice in your diet 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 Good vs. Bad Cholesterol Total Cholesterol Levels < 200 LDL = BAD! Needs to be below 100 HDL = GOOD!! Needs to be 60 or above Triglycerides = BAD! Needs to be 150 or below Cholesterol Quiz http://www.americanheart.org/presenter.jhtml?identifier=3032767 Cholesterol Video 23:00 http://player.discoveryeducation.com/index.cfm?guidAssetId=D0DC3225-D27A-4E3A-8CD07BCB3B1241A4&blnFromSearch=1&productcode=US 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
