Final answer:
Phosphoglycerate kinase is the enzyme that transfers a high-energy phosphate from 1,3BPG to form 3-phosphoglycerate, generating ATP in the process.
Step-by-step explanation:
The enzyme that transfers a high-energy phosphate between 1,3-bisphosphoglycerate (1,3BPG) and 3-phosphoglycerate is called phosphoglycerate kinase. During glycolysis, this enzyme facilitates the transfer of a phosphate group from 1,3BPG to ADP, thereby generating ATP and resulting in the formation of 3-phosphoglycerate. This step is crucial for cellular energy production as it is one of the few steps in glycolysis that directly generates ATP through substrate-level phosphorylation.