Lipids Fats Oils 2003 2004 Lipids Concentrated energy

Lipids: Fats & Oils 2003 -2004

Lipids Concentrated energy molecules 2003 -2004

Lipids § Examples u fats u oils u waxes u hormones § sex hormones w testosterone (male) w estrogen (female) 2003 -2004

Lipids § Function: u energy storage § very concentrated § twice the energy as carbohydrates! cell membrane u cushions organs u insulates body u § think whale blubber! 2003 -2004

Molecular Structure of Fat not a chain (polymer) = just a “big fat molecule” 2003 -2004

Saturated fats § Most animal fats u solid at room temperature § Limit the amount in your diet contributes to heart disease u deposits in arteries u 2003 -2004

Unsaturated fats § Plant, vegetable & fish fats u liquid at room temperature § the fat molecules don’t stack tightly together § Better choice in your diet 2003 -2004

Saturated vs. unsaturated 2003 -2004

Other lipids in biology § Cholesterol good molecule in cell membranes u make hormones from it u § including sex hormones u 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 u heads are on the outside touching water u § “like” water u tails are on inside away from water § “scared” of water u forms a barrier between the cell & the outside 2003 -2004