What makes McDonald’s fries taste SOOOO good?

Lipids Lipids are composed of C, H, and O Greater H:O ratio than 2:1 Primary function is energy storage. Energy is stored in C-H bonds. More efficient in storing energy than carbohydrates Other functions: waterproofing, membranes in cells, hormones Macromolecules: Fats, Waxes and Oils.

Structure Lipids are made of 2 parts Glycerol - an alcohol - Serves as backbone of the molecule 3 Fatty acids - Long hydrocarbon chains

Dehydration Synthesis of a Lipid

Hydrolysis of a Lipid

Types of fats Saturated fats have long chains with no double-bonds Unsaturated fats have double bonds Polyunsaturated fats have many double bonds –Each time a double bond is encountered, the molecule "Bends" slightly, resulting in a lower density of the lipid. This makes the molecule more likely to remain liquid at room or body temperatures. And thus, less likely to clog cardiac arteries.

Other Lipids 4 Other types of biologically important Lipids –Phospholipids - Important for membrane structure –Steroids - eg. Cholesterol & testosterone. Provide membrane support / serve as hormones –Terpenes - serve as important components of pigments –Prostaglandins - appear to act like localized hormones to induce cellular/tissue responses

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