Final answer:
The transfer of phosphate from PEP to ADP results in ATP synthesis during glycolysis, which is an energy-yielding metabolic pathway.
Step-by-step explanation:
When transfer of P from phosphoenolpyruvate (PEP) to ADP occurs, ATP synthesis is the result. This reaction takes place during the last step of glycolysis, where the high-energy phosphate from PEP is transferred to ADP, generating ATP and pyruvate. Glycolysis is a series of biochemical reactions that break down glucose into pyruvate, producing a net gain of energy in the form of ATP and NADH. The transfer of phosphate to ADP creating ATP in this process is exergonic, meaning it releases energy that is captured to synthesize ATP, as opposed to requiring an input of energy.