The human body cannot store excess protein. What happens to amino acids that are not needed?
They are broken down in the liver to form urea, which is excreted by the kidneys.
They are broken down in the kidneys to form urea, which is excreted by the liver.
They are converted in the liver into glycogen, which is excreted by the kidneys.
They are converted in the kidneys into glycogen, which is stored in the liver.
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.