<prompt> Which is not a product of the pentose phosphate pathway?Sedoheptulose-7-phosphateO2Glyceraldehyde-3-phosphateNADPH  <response>: Step 5: Transketolase Reaction - Transketolase is a thiamine pyrophosphate TPP dependent enzyme. It transfers two-carbon unit with keto group from xylulose-5-phosphate to ribose-5-phosphate to form a 7 carbon sugar, sedoheptulose-7-phosphate and glyceraldehyde-3- phosphate. Transketolase enzyme will transfer the group from a donor ketose to an aldose acceptor. In thiamine deficiency transketolase activity is decreased. The reaction may be summarized as 5C 5C 7C 3C. REF: DM VASUDEVAN TEXTBOOK OF BIOCHEMISTRY, SIXTH EDITION,PG.NO.,114. 