Q. Which of these steps in Krebs’ cycle indicates substrate level phosphorylation?
A) Conversion of succinyl acid to $\propto$-ketoglutaric acid
B) Conversion of succinic acid to malic acid
C) Conversion of succinyl Co-A to succinic acid
D) Conversion of malic acid to oxalo acetic acid
Explanation
During the conversion of Succinyl Co-A to Succinic acid, a molecule of GTP is synthesized. This is a substrate level phosphorylation. In a coupled reaction, GTP is converted to GDP with the simultaneous synthesis of ATP from ADP.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.