Lipids 5.0 / 5 based on 6 ratings ? BiologyBiological molecules, organic chemistry and biochemistryASAQA Created by: meganbradfield1Created on: 23-03-16 17:36 What are the main groups of lipids? Triglycerides (fats+oils; phospholipids & waxes. 1 of 19 What do phospholipids allow membranes to be? Flexible and to transfer substances 2 of 19 Name 4 roles of lipids? Insulation; Protection; Waterproofing; Energy source. 3 of 19 Name some characteristics of a lipid? Insoluble, but soluble in organic solvents; contain carbon, hydrogen & O2; proportion of O2 to carbon & hydrogen smaller than in carbs. 4 of 19 What is the structure of the triglyceride? 3 fatty acids & 1 glycerol molecule 5 of 19 What does each fatty acid form with glycerol? An ester bond through a condensation reaction. 6 of 19 What group do all fatty acids have and what is attached to it? A carboxyl group with a hydrocarbon chain 7 of 19 What is the fatty acid considered as if the hydrocarbon chain has no carbon-carbon double bonds? Saturated 8 of 19 What is the fatty acid if the hydrocarbon chain has a double single carbon bond? Mono-unsaturated 9 of 19 What is the fatty acid if the hydrocarbon chain has more than one double carbon bond? Polyunsaturated 10 of 19 In the structure of a phospholipid, what is one of the fatty acids replaced by? A phosphate molecule. 11 of 19 In the structure of a phospholipid, what are fatty acid molecules? Hydrophobic 12 of 19 In the structure of phospholipids, what are the phosphate molecules? Hydrophilic 13 of 19 What are phospholipids made up of? Hydrophilic heads & hydrophobic tails 14 of 19 What do hydrophilic heads do? Move towards the water in the cell (point inwards the cell). 15 of 19 What do hydrophobic tails do? Move away from water (point outwards the cell). 16 of 19 What is the test for lipids? The emulsion test. 17 of 19 In the emulsion test, what solution is added to the sample of lipids? Ethanol 18 of 19 What colour will form if a lipid is present? Cloudy-white 19 of 19
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