Biology 0.0 / 5 ? BiologyBiological molecules, organic chemistry and biochemistryA2/A-levelAQA Created by: EmsdaviesCreated on: 30-03-17 12:45 What is the structure of a Triglycerides? One molecule of glycerol with 3 fatty acids attached to it. 1 of 8 Why do fatty acids have 'tails'? There are made of hydrocarbons, which are hydrophobic ( REPEL WATER MOLECULES) The tails make lipids insoluble in water. 2 of 8 What are triglycerides formed by? Condensation reactions. When the ester bond is formed, a water molecule is released. THIS HAPPENS 3 TIMES. 3 of 8 What are saturated fatty acids? They don't have double bonds between their carbon atoms. It is saturated with hydrogen. 4 of 8 What are unsaturated fatty acids? They have at least one double bond between carbon atoms, which cause the chain to kink. 5 of 8 Why is there long tails good for energy storage? They contain lots of chemical energy. When they are broken down, loads of energy is released. 6 of 8 Why is Triglycerides being insoluble a good thing? They don't affect water potential. The triglycerides clump together as insoluble droplets 7 of 8 How do you test for Lipids? Emulsion test-> shake the substance with ethanol for about a minute, then pour the solution into water and any lipid will show up as a milky solution. 8 of 8
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