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8 Cards in this Set
- Front
- Back
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What is a triglyceride? |
fats and oils |
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How is a triglyceride synthesised and what bonds hold it together? |
they are formed by the condensation of one molecule of glycerol and three molecules of fatty acid. They are held together by ester bonds. |
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Describe a saturated fatty acid molecule |
all the carbon atoms are all held together by single covalent bonds |
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Describe an unsaturated fatty acid molecule |
at least some of the carbon atoms are held together by double covalent bonds. They have at least one double bond between the carbon atoms in their chain |
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How does the structure of lipids relate to their role in energy store? |
they have a high proportion of H atoms relative to O atoms and so yield more energy than the same mass of carbohydrate |
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How does the structure of lipids relate to their role in waterproofing? |
they are hydrophobic - they are made of a molecule of glycerol and 3 molecules of fatty acids and are held together by ester bonds |
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How does the structure of lipids relate to their role in insulation? |
Layers of fat in the subcutaneous layer, provides insulation and protection from cold |
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How does the structure and properties of phospholipids relate to their function in cell membranes? |
Phospholipids like to line up and arrange themselves into two parallel layers, called a phospholipidbilayer The phospholipid bilayer is selectively permeable. The heads are hydrophilic and the tails are hydrophobic, so only certain materials are able to enter the cell. There are also proteins imbedded in the bilayer to transport materials into and out of the cell. |
