Lipids 3.5 / 5 based on 3 ratings ? BiologyBiological molecules, organic chemistry and biochemistryASAQA Created by: Blackcurrant.Created on: 22-10-12 11:22 What is the differnce between fats and oils? Fats are solid at room temperature, oils are liquids 1 of 22 What elements do they contain? Carbon, oxygen, hydrogen 2 of 22 What are the three main groups of lipids? Tricylcerides, phospholipids, waxes 3 of 22 What makes up a triglyceride? 3 fatty acids and glycerol 4 of 22 What is the molecular formula of glycerol? C3H8O3 5 of 22 What are the bonds between glycerol and a fatty acid called? Ester bonds 6 of 22 Name the 7 uses of triglycerides. Energy supply, Thermal Insulation, Electrical Insulation, Metabolic water, Buoyancy, Waterproofing, Protection 7 of 22 What is the name given to fat under the skin that acts as a thermal insulator? Subcutaneous fat 8 of 22 What is the name given to fats that protect vital organs? Adipose tissue 9 of 22 How do fats help with electrical insulation? Surround the axon of the neuron so that it is not conducted to other tissues before its final destination 10 of 22 How do fats help with buoyancy? Fats are less dense than water so float 11 of 22 How do fats help with waterproofing? Sebacous glands in the skin produce an oily secretion which prevents waterlogging of fur/feathers 12 of 22 How is metabolic water produced? Oxidation of lipids 13 of 22 What makes up a phospholipid? Glycerol, 2 fatty acids and a phosphate group 14 of 22 What is meant by a saturated lipid? It has no double carbon-carbon bonds 15 of 22 What is meant by a mono-unsaturated lipid? It contains one double carbon-carbon bond 16 of 22 What is meant by a poly-unsaturated lipid? It contains more than one double carbon-carbon bond 17 of 22 Why are poly-unsaturated fatty acids always oils? Double carbon-carbon bonds cause the molecule to bend so they cannot pack together in a solid 18 of 22 What do fatty acids always contain? A carboxyl group (COOH) 19 of 22 What is the general formula of a fatty acid? CH3(CH2)COOH 20 of 22 Give examples of 2 fatty acids Stearic acid, C17H35COOH, Oleic acid, C17H33COOH 21 of 22 What is the biochemical test for lipids? Mix with alcohol and water - white cloudy suspension forms 22 of 22
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