Explain how xylulose-5-phosphate from the pentose phosphate pathway influences glycolysis.

• A. Xylulose-5-phosphate inhibits PFK2, reducing glycolysis.
• B. Xylulose-5-phosphate directly activates PFK1, enhancing glycolysis.
• C. Xylulose-5-phosphate stimulates protein phosphatase, activating PFK2 and enhancing glycolysis.
• D. Xylulose-5-phosphate has no effect on glycolysis.

Answer: (C)