How does ADP become ATP?


Quick Answer

Adenosine diphosphate becomes adenosine triphosphate when a phosphate molecule is bonded to it. ADP has two phosphate groups, and when an additional phosphate group is added, it becomes ATP.

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How does ADP become ATP?
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Full Answer

Energy is required to jump start the reaction from ADP to ATP. The chemical equation is written as ADP + Pi + energy ? ATP, whcih means that adenosine diphosphate plus a phosphate molecule and a jolt of energy yields adenosine triphosphate. This reaction typically occurs in both directions; ATP breaks down into ADP, and ADP rebuilds itself back into ATP.

This process is mostly dependent upon the addition and subtraction of a phosphate molecule and the energy required to bond the phosphate to ADP to form ATP. For instance, in order for a phosphate to bond to ADP, a catalyst is needed. The two-stranded phosphate group of ADP requires energy to bond it to an additional phosphate. When ATP breaks down into ADP, it releases energy. As the energy is released, the three-stranded phosphate bond of ATP is broken into two strands. According to Georgia State University, this process generally occurs with water and is written as ATP + H2O ? ADP + Pi. When ATP is added to water, it yields an ADP molecule and a phosphate. When this reaction happens in the ATP to ADP direction, it is known as hydrolysis.

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