The human body cannot store excess protein.
Describe what happens to amino acids that the body does not need.
A person eats a meal containing far more protein than their body needs. Suggest why their urine contains more urea than usual on that day.
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.