LIPIDS Families of lipids include fats, phospholipids, and steroidsFamilies of lipids include fats, phospholipids, and steroids These families aboveThese families above DO NOT mix with water

FATS Major function is for energy storage Fat molecules are made up of four parts: a molecule of glycerol (on the right) and three molecules of fatty acids. Glycerol is a 3 carbon alcohol Fatty Acids have LONG carbon skeletons that range in length

Saturated FATS Have the maximum number of the hydrogen atoms at each carbon (no double bonds) Most fats present in animals ie. Cows, sheep Solid at room temp. It contributes to cardiovascular disease since their structure is “saturated”

Fat continued..

Unsaturated FATS Have one or more DOUBLE BONDS Examples: Plant fats Liquid at room temp. Double Bond

Phospholipids Only have 2 fatty acids rather than 3 The 3 rd carbon is attached to a phosphate group (water loving) Heads are hydrophillic (water loving) Tails are hydrophobic (water hating) Cell membrane is made of 2 layers of phospholipids

Phospholipid Structure

Steroids Made of a CARBON skeleton of 4 fused rings Cholesterol is an important steroid for the body It is the precursor for the production of other steroids and hormones BUT a high concentration of cholesterols causes ARTHEROSCLEROSIS which can eventually lead to heart attacks!! Oh No!

Steroids Structure