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Adenosine Triphosphate (ATP) - Definition, Structure and Function Adenosine triphosphate, also known as ATP, is a molecule that carries energy within cells. It is the main energy currency of the cell, and it is an end product of the processes of photophosphorylation (adding a phosphate group to a molecule using energy from light), cellular respiration, and fermentation. All living things use ATP. 1. Draw and label the parts of an ATP and ADP molecule. . 2. Explain ... Adenosine triphosphate (ATP) consists of an adenosine molecule bonded to three phophate groups in a row. In a process called cellular respiration, chemical energy in food is converted into chemical energy that the cell can use, and stores it in molecules of ATP. Chapter 8: Photosynthesis - Paperzz.com ATP has 3 phosphate groups and ADP has 2 phosphates 5. Label each part of the ATP molecule illustrated below. Adenosine Ribose Phosphate groups 6. When a cell has energy available, how can it store small amounts ...