What is the role of transketolase in the pentose phosphate pathway?

• A. It transfers two carbons from xylulose 5-phosphate to ribose 5-phosphate.
• B. It isomerizes ribulose 5-phosphate to ribose 5-phosphate.
• C. It converts 6-phosphogluconate to ribulose 5-phosphate.
• D. It transfers three carbons from pseudoheptulose 7-phosphate to glyceraldehyde 3-phosphate.

Answer: (A)