Question

In which of the following reactions of glycolysis does oxidation take place?

• A. Glucose-6-phosphate to fructose-6-phosphate
• B. Glyceraldehyde-3-phosphate to 1,3-diphosphoglycerate
• C. 1,3-Diphosphoglycerate to 3-phosphoglycerate
• D. 2-Diphosphoglycerate to phosphoglycerate

Answer 1

The correct option is B Glyceraldehyde-3-phosphate to 1,3-diphosphoglycerate

Glyceraldehyde-3-phosphate is oxidized and phosphorylated to form 1,3-diphosphoglycerate, and this process results in the reduction of NAD${}^{+}$:

Glyceraldehyde-3-phosphate + NAD${}^{+}$ + Pi $\to$ 1,3-Diphosphoglycerate + NADH