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11 Cards in this Set
- Front
- Back
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Elements |
Carbon, Hydrogen and Oxygen |
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Interaction with water |
Lipids do not mix with water nor are they soluble because they are non polar, the electrons in their outer orbitals are evenly distributed. |
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Macromoleules |
large complex molecules, not built from repeating units or monomers |
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Triglycerides Components |
Formed by combining one glycerol molecule with three fatty acids. |
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Triglycerides Bonds |
Ester bonds are left after condensation/ esterification reactions between the hydroxyl groups of the 4 molecules. |
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Saturated |
Fatty acid chains that have no double bonds between the carbon atoms are saturated. Usually solid at room temp |
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Unstaurated |
A fatty acid with double bonds between some carbon atoms is called unsaturated. A single double bond = monounsaturated Two or more = polyunsaturated The presence of double bonds produces a kink meaning they cannot pack so closely together meaning they are a liquid at room temp. |
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Phospholipids |
modified triglycerides, they contain an element of phosphorus along with carbon, hydrogen and oxygen. One of the fatty acid chains is replaced with a phosphate group to make a phospholipid. |
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Sterols |
also known as steroid alcohols, complex alcohol molecules based on a 4 carbon ring structure with a hydroxyl group at one end. The hydroxyl is hydrophilic and the rest is hydrophobic. |
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Cholestrtol |
Manufactured in the liver and intestines, important in the formation of cell membranes, positioned between the phospholipids it adds stability to the membrane and regulates fluidity. |
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Roles of lipids |
membrane formation (hydrophobic barriers) Hormone production Electrical insulation Waterproofing thermal insulation cushioning buoyancy |
