BiologicalMolecules160-page10 - • Most lipids...

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Biological Molecules - 10 Lipids Many of our common substances are lipids, which include fats, oils, and waxes along with a variety of related substances. Lipid Functions Fuel reserve molecules (Lipids are energy rich) Structure of cell (plasma) membranes Protective surface coatings and insulation Many hormones (regulatory chemicals) Major types of Lipids 1. Triglycerides commonly known as the fats and oils 2. Waxes (similar to triglycerides) 3. Phospholipids 4. Sterols (or steroids) 5. Terpenes Lipid Characteristics Most lipids are strictly nonpolar and hydrophobic, so they dissolve in nonpolar substances, but not in water.
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Unformatted text preview: • Most lipids feel "greasy" • Lipids contain large regions of just carbon and hydrogen, as carbon-carbon bonds and carbon-hydrogen bonds Structure of Lipids • Lipids contain: • carbon • hydrogen • oxygen • However – the proportion of oxygen is low, so lipids are mostly hydrocarbons • The chemical structure of our fats and oils, the most common lipids, is based on fatty acid building blocks and an alcohol, glycerol • The terms fats and oils are terms of convention Fats are "hard" or solid at room temperature Oils are liquids at room temperature...
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