Which structural change occurs in the reaction catalyzed by phosphoglucoisomerase during glycolysis?

• A. Glucose 6-phosphate is converted to glucose 1-phosphate by isomerization.
• B. Glucose 6-phosphate is converted to fructose 6-phosphate by rearranging the carbon skeleton.
• C. Glucose 6-phosphate is converted to glucose 6-phosphate by oxidation.
• D. Glucose 6-phosphate is converted to fructose 1,6-bisphosphate by adding a phosphate group.

Answer: (B)