Rearrangement followed by a second ATP phosphorylation involves step no. _ of glycolysis.

Explanation

Step number 7 of glycolysis is the correct option because it represents the second substrate-level phosphorylation in the pathway. In this step, 1,3-bisphosphoglycerate donates a high-energy phosphate group to ADP to form ATP and 3-phosphoglycerate, catalyzed by the enzyme phosphoglycerate kinase. This step is critical because it directly generates ATP, which is one of the main goals of glycolysis, and it follows the rearrangement and oxidation steps that prepare the molecule for efficient energy transfer. The reaction not only produces energy but also helps maintain the flow of intermediates through the pathway, ensuring that glycolysis proceeds efficiently to ultimately produce pyruvate.Step 3 is incorrect because it consumes ATP rather than producing it, as fructose-6-phosphate is phosphorylated to fructose-1,6-bisphosphate. Step 6 is also incorrect because, although it produces a high-energy intermediate, no ATP is directly formed; it only sets the stage for the next ATP-generating step. Step 10 is not correct in this context because it is the third and final ATP-generating step, not the second, involving the conversion of phosphoenolpyruvate to pyruvate.