Q. In which one of the following substrate phosphorylation does not occur :

Q. In which one of the following substrate phosphorylation does not occur :

1. 1, 3-biphosphoglyceric acid ⟶ 3 phosphoglyceric acid
2. Glucose 6-phosphate ⟶ Fructose 6-phosphate
3. Succinyl CoA ⟶ Succinic acid
4. Phosphoenol pyruvic acid ⟶ Pyruvic acid

Solution :

Correct option : B Phosphorylation is the process of adding a phosphate group to adenosine triphosphate (ADP) to form the adenosine triphosphate (ATP) by the enzyme kinase. A. 1,3- biphosphoglyceric acid + ADP → 3- phosphoglyceric acid + ATP. It is substrate phosphorylation. B. No phosphate group is added in Glucose 6-phosphate→ 3 phosphoglyceric acid C. Succinyl- CoA + H₂O + GDP/ADP → Succinate + CoA + GTP/ATP. D. Phosphoenol pyruvic acid + AMP + P~P → Pyruvic acid +ATP + H₃PO₄. Hence, the correct answer is ‘Glucose 6- phosphate → Fructose 6- phosphate’.