Lipids - Biological molecules. AQA A-level biology 7401

2 lessons which cover all the learning objectives for the lipids lesson from the biological molecules unit of the course (AQA A-level biology 7401 year 1).

Learning objectives covered are:

• Triglycerides and phospholipids are two groups of lipid.
• Triglycerides are formed by the condensation of one molecule of glycerol and three molecules of fatty acid.
• A condensation reaction between glycerol and a fatty acid (RCOOH) forms an ester bond.
• The R-group of a fatty acid may be saturated or unsaturated.
• In phospholipids, one of the fatty acids of a triglyceride is substituted by a phosphate-containing group.
• The different properties of triglycerides and phospholipids related to their different structures.
• The emulsion test for lipids.

Students should be able to:
• recognise, from diagrams, saturated and unsaturated fatty acids
• explain the different properties of triglycerides and phospholipids.