Long term energy storage, insulation, cushion hydrocarbons with little or no affinity to water hydrophobic 

Basic unit of most lipids is the fatty acid

Saturated fatty acis contain only single bonds 

Found in animal fats and usually solid 

Unsaturated fatty acids contain double bonds

Founs in plants and are liquid cause kinks or bends in the carbon chain and prevent them from packing together and tightly solidfying at room temp

3 fatty acids attached to glycerol 

Bodys most abundant lipids 

Stored as droplets in fat cells

Glycerol backbone, 2 fatty acids and a phosphate containing hydrophilic head 

Main component of cell membranes

No fatty acids 

Rigid backbone of four fused together carbon rings 

Examples: cholesterol 

Most common type in animals 

Steroids( sex hormones ) 

Bile salts