Question

Which of the following is not an oxidation reaction?

• A. $1,3$ Bis PGAL to $1,3$ Bis PGA
• B. $1,3$ Bis PGA to $3$- PGA
• C. Pyruvic acid to acetyl CoA
• D. Malic acid to oxaloacetic acid

Answer 1

Answer: (B)

$1,3$ Bis PGA to $3$- PGA

The four steps of aerobic respiration are glycolysis, formation of acetyl CoA, TCA cycle and the electron transport chain. Out of the given four reactions, conversion of bisphosphoglylceric acid into 3-phosphoglyceric acid is not an oxidation reaction. In this, phosphoglycerate kinase enzyme transfers the phosphate group from 1,3 Bis PGA to ADP and forms 3 - PGA. The other 3 reactions are oxidation reaction in which NADH molecules are produced from the NAD${}^{+}$ molecules.

Thus, the correct answer is '1,3 Bis PGA to 3- PGA.'