A mammal is asleep. The cells in its body are still respiring. Which statement explains why respiration must continue all the time in living cells?
Glucose is only taken into the cells while the organism is asleep.
Oxygen is only stored in the cells while the organism is asleep.
ATP is stored in large amounts and must be broken down constantly.
ATP is not stored in large amounts but is used all the time.
113 exam-style questions on OCR GCSE Biology 1.3 Respiration, covering 1.3.1 Cellular respiration supplies ATP, 1.3.2 Aerobic and anaerobic respiration, 1.3.3 Sugars and carbohydrates, 1.3.4 Amino acids and proteins, and 1.3.5 Fatty acids and lipids. Each one has a worked solution and a mark scheme showing where the marks go.