The 14C-Labeled glyceraldehyde 3-phosphate was added to a yeast extract. After a short time, fructose 1,6-biphosphate labeled with 14C at C-3 and C-4 was isolated. Explain what was the location of the 14C label on the starting glyceraldehyde 3-phosphate? Depict the structure Where did the second 14C come from in the fructose 1,6-biphosphate?