• Large and varied group • Made up of mostly C & H atoms (O too!) • Do not dissolve in water • Uses: – Energy Storage – Waterproofing – Structure – Hormones
• function to cushion organs, as insulation & in long-term energy storage • Made of two kinds of molecules – Glycerol – Fatty acids • Saturated Fatty Acid: – Carbons joined by single bonds – Maximum H atoms • Unsaturated Fatty Acid: – At least one double bond between carbons in the fatty acid
Fatty acids that contain 1 or more double bonds between carbon atoms are said to be unsaturated.
Fatty acids with only single covalent bonds between the carbon atoms are referred to as saturated.
• Building block of cell membrane – Only has 2 fatty acids – 1 phosphate group • Have – Hydrophilic heads – Hydrophobic tails
• Carbon Skeleton has: – Four interconnected rings – Different groupings of atoms (or functional groups) attached • Cholesterol • Hormones