Lipids 0.0 / 5 ? BiologyBiological moleculesASAQA Created by: AliceCreated on: 12-01-14 15:10 What three elements are lipids made from? Carbon, Hydrogen, and Oxygen. 1 of 12 Are lipids soluble or insoluble in water? Insoluble. 2 of 12 What solvents are lipids soluble in? Alcohol and acetone. 3 of 12 What are the three main groups of lipids? Triglycerides, phospholipids, and waxes. 4 of 12 Lipids have five functions. What are they? 1. Plasma membranes. 2. Energy source. 3. Insulation. 4. Protecting organs. 5. Waterproofing. 5 of 12 How do three fatty acids and glycerol form a triglyceride? By a condensation reaction. Forms a triglyceride with three molecules of water. 6 of 12 What makes a lipid saturated? No carbon-carbon double bonds. All carbon atoms are saturated with hydrogen atoms. 7 of 12 What is the difference between mono-unsaturated and polyunsaturated lipids? Mono-unsaturated has a single double bond. Polyunsaturated has more than 1 double bond. 8 of 12 Discuss phospholipid structure. They are similar to lipids, but have 2 fatty acids and a phosphate molecule. 9 of 12 Why are phosphate molecules different to fatty acid molecules in terms of attraction? Whereas fatty acids are hydrophobic and repel water, phosphate molecules attract water (hydrophilic!) 10 of 12 There are two parts to a phospholipid. Name them. Hydrophilic head which interacts with water and not fat. Hydrophobic tail which orients away from water and mixes with fat. 11 of 12 What do we call a molecule with two differently-behaved ends? Polar 12 of 12
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