During glycolysis, which one of the following intermediates...

During glycolysis, the conversion of 3-phosphoglyceraldehyde (3-PGAL) to 1,3-bisphosphoglyceric acid (1,3-BPGA) is catalyzed by the enzyme glyceraldehyde-3-phosphate dehydrogenase.

In this step, 3-PGAL undergoes oxidation by the removal of hydrogen, which is accepted by $NAD^{+}$ to form $NADH + H^{+}$. Simultaneously, it undergoes phosphorylation by the addition of inorganic phosphate (H_3PO_4$) to form 1,3-BPGA.<br><br>Fructose-1,6-diphosphate undergoes cleavage to form 3-PGAL and DHAP.<br><br>3-PGA undergoes isomerization to form 2-PGA.<br><br>2-PGA undergoes dehydration to form phosphoenolpyruvate (PEP).<br><br>Answer: 3-PGAL$