ATPAQA A-Level Biology: Mind map

Exam questions on ATP

1. The hydrolysis of ATP to ADP and inorganic phosphate (Pi) releases about 30 kJ of energy per mole of ATP.
   Describe the hydrolysis of ATP.2 marks
2. In the first step of glycolysis, glucose reacts with ATP to form glucose phosphate and ADP. Glucose phosphate is more reactive than glucose, and the reaction is catalysed by an enzyme.
   Explain how the hydrolysis of ATP makes the formation of glucose phosphate possible.2 marks
3. During intense exercise the muscles of an athlete hydrolyse ATP at a rate of 0.80 mol per minute, but the muscles contain only about 0.10 mol of ATP at any one time. Assume that 30 kJ of energy is released per mole of ATP hydrolysed.
   Suggest why ATP, rather than glucose, is the immediate source of energy for muscle contraction.3 marks