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A-Level Biology Unit 4: Chapter 2 ATP Common Exam Questions and Model Answers Why is ATP useful? Broken down in a one step / single bond broken; Immediate energy compound/makes energy available rapidly; Phosphorylates/adds phosphate; Makes (phosphorylated substances) more reactive / lowers activation energy; Reformed/made again; Give two ways in which the properties of ATP make it a suitable source (this means RELEASE not storage) of energy in biological processes. Energy released in small/suitable amounts; Soluble; Involves a single/simple reaction; Give 2 advantages of ATP as an energy storing molecule So… if in doubt these two would be best: 1) Involves a single reaction to break it down 2) Energy rapidly released in small amounts Why do we need to synthesise a large mass of ATP each day? 1. ATP is unstable; 2. ATP cannot be stored / is an immediate source of energy; 3. Named process uses ATP ; 4. ATP only releases a small amount of energy at a time; Write a simple equation to show how ATP is synthesised from ADP. ADP + Pi → ATP; How is ATP used in a cell (be careful to think about type of cell mentioned)