ATP and ADP

• ATP (Adenosine triphosphate) is the energy carrier in living cells
• Cells require energy for chemical reactions, while other reactions release energy
• ATP is a large molecule made up of an adenosine molecule (enzyme) and three phosphate (P) molecules
• When energy is required by the cell, ATP is broken down into ADP (Adenosine diphosphate) and a phosphate molecule and energy is released
• When energy is released in a chemical reaction, it is used to form a bond between ADP and P molecules to form ATP. ATP will release the energy again when needed
• ATP is formed in the Light Phase, it carries the energy to the dark phase and releases it there