Chemicals of Life (Continued): Lipids and Steroids – S5 Biology Notes

These teacher-prepared Senior Five Biology notes carry on the topic of chemicals of life. They start with the iodine test for starch and then cover lipids in detail. Topics include the structure of fatty acids, the difference between saturated and unsaturated fatty acids, and how triglycerides form through ester bonds. The notes also explain phospholipids, glycolipids and waxes. The biological roles of lipids are set out, including energy storage, insulation, protection, buoyancy and waterproofing. Steroids and cholesterol are covered next, along with lipoproteins, essential fatty acids in the diet and the emulsion test for lipids. Assignments and practical observation tables are included throughout for learners to complete.