A fully resourced A Level Biology lesson specifically tailored to the Pearson Edexcel International A Level Biology specification.

This lesson develops students’ understanding of carbohydrates by focusing on the formation, structure and biological roles of polysaccharides. It builds directly on prior learning about monosaccharides, disaccharides, condensation reactions and glycosidic bonds.

The lesson covers:

• The differences between monosaccharides, disaccharides and polysaccharides
• How alpha-glucose monomers join through condensation reactions
• The formation of glycosidic bonds in polysaccharides
• The structure and function of starch
• The differences between amylose and amylopectin
• The structure and role of glycogen
• How branching affects compactness and the rate of hydrolysis
• How the structures of starch and glycogen make them suitable energy-storage molecules

Students explore how repeated condensation reactions form long carbohydrate polymers and then examine the structural adaptations of starch and glycogen. They compare amylose, amylopectin and glycogen, including their glycosidic bonds, degree of branching, solubility and suitability for energy storage.

The resource includes:

• Retrieval practice linked to monosaccharides and disaccharides
• Clear teacher explanations and diagrams
• Independent research tasks
• Opportunities to compare biological molecules
• Structure–function application questions
• Knowledge-check activities
• A comparison plenary on starch and glycogen
• Teacher answers throughout
• Content matched to the Edexcel IAL Biology specification

Students will develop their ability to relate molecular structure to biological function, including explaining why starch and glycogen are insoluble, compact and readily hydrolysed when glucose is required for respiration.

Suitable for Edexcel International A Level Biology classroom teaching, revision, independent study or cover lessons.