2626991
Description
Flashcards by Charlotte Hewson, updated more than 1 year ago
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Created by Charlotte Hewson
over 9 years ago
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| Question | Answer |
| what do lipids contain? | carbon, hydrogen and oxygen |
| what are lipids insoluble in? | water |
| what are lipids soluble in? | organic solvents such as alcohol and acetone |
| what are the main groups of lipids? | triglycerides, phospholipids and waxes |
| what is the main role of lipids? | plasma membranes |
| what are 4 roles of lipids? | -energy source -waterproofing -insulation -protection |
| what are triglycerides made up of? | three (tri) fatty acids and a glycerol (glyceride) |
| what kind of reaction bond these? | condensation |
| how do triglycerides become varied? | differences in the fatty acids |
| what do all fatty acids have in common? | a carboxyl (-COOH) group with a hydrocarbon chain attached |
| what makes the fatty acid saturated? | if there are no carbon=carbon double bonds because all carbon atoms are linked to the maximum possible number of hydrogen atoms |
| what is it called if there is one double bond? | Mono-unsaturated |
| what is it called if there are more than one double bonds? | polyunsaturated |
| what makes a phospholipid different to lipids? | one of the fatty acid molecules are replaced by a phosphate molecue |
| what are the features of a phospholipid? | hydrophilic head (phosphate) hydrophobic tail (fatty acid) |
| what is the test used to test for lipids? | emulsion test |
| what is the process of this test? | -2cm^3 of the sample mixed with 5cm^3 of ethanol -shake thoroughly -add 5cm^3 of water -cloudy white = lipid present |
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