A reactant is a substance that is present (and is modified) in a chemical reaction. Moreover, endergonic reactions are chemical reactions that consume energy.
- The fate of the phosphate group that is removed when ATP is converted to ADP is that it is acquired by a reactant in an endergonic reaction.
- ATP synthesis is an endergonic reaction in which ADP and phosphate (Pi) are reactants.
- ATP is a product that is at a higher energy level than ADP and phosphate (i.e., the reactants), thereby this reaction consumes energy.
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