Are heterogeneous group of compounds (fats, oils, steroids, waxes and related compounds), that are related more by their physical than by their chemical properties.

Common Properties of lipids?

Does lipids contains fat-soluble vitamins and essential fatty acids and high energy value?

stored in adipose tissue serves as thermal insulator in the subcutaneous tissues and around certain organs

act as electrical insulator, allowing rapid propagation of depolarization waves along myelinated nerves

can be converted into smaller molecules by hydrolysis

Cannot be cleaved into smaller molecules by aqueous hydrolysis

it inclueds fats and waxes, which are esters of fatty acids with various alcohol.

are esters of fatty acids containing groups in addition to an alcohol and one or more fatty acids.

Lipids containing, in addition to fatty acids and an alcohol, a phosphoric acid residue

Lipids containing a fatty acid, sphingosine, and carbohydrate.

Lipids such as sulfolipids and amino lipids. Lipoproteins may also be placed in this category.

include fatty acids, glycerol, steroids, other alcohols, fatty aldehydes, ketone bodies, hydrocarbons, lipid-soluble vitamins and micronutrients, and hormones.

Acylglycerols, cholesterol, and cholesteryl ester are uncharged

Major Roles of Biological Lipids