Which change is a metabolic reaction that directly uses small molecules to build a larger molecule?
Glycogen is converted into glucose during a period without food
Protein is broken down and excess amino groups form urea
Glycerol joins with three fatty acids to form a lipid molecule
Glucose reacts with oxygen to form carbon dioxide and water
51 exam-style questions on AQA GCSE Biology 4.2 Respiration, covering 4.2.1 Aerobic and anaerobic respiration, 4.2.2 Response to exercise, and 4.2.3 Metabolism. Each one has a worked solution and a mark scheme showing where the marks go.