1. The four primary organic macromolecules
Lipids are used as hydrophobic structural components to create barriers to water, and also as a mechanism of energy storage
Fats (composed of glycerol and fatty acids)
Fatty Acids

2. The four primary organic macromolecules
Lipids are used as hydrophobic structural components to create barriers to water, and also as a mechanism of energy storage
Fats (composed of glycerol and fatty acids)
Phospholipids (composed of a charged phosphoric acid and uncharged fatty acid chains)

3. The four primary organic macromolecules
Lipids are used as hydrophobic structural components to create barriers to water, and also as a mechanism of energy storage
Fats (composed of glycerol and fatty acids)
Phospholipids (composed of a charged phosphoric acid and uncharged fatty acid chains)

4. The four primary organic macromolecules
Lipids are used as hydrophobic structural components to create barriers to water, and also as a mechanism of energy storage
Fats (composed of glycerol and fatty acids)
Phospholipids
Steroids (have a specific four-ring structure) - include cholesterol, steroid hormones, vitamin D