Question

During citric acid cycle substrate level phosphorylation takes place when there is conversion of:

• A. Succinic acid $\to$ Fumaric acid
• B. Fumaric acid $\to$ Malic acid
• C. Succinyl CoA $\to$ Succinic acid
• D. $\alpha$-ketoglutaric acid $\to$ Succinyl CoA

Answer 1

The correct option is C Succinyl CoA $\to$ Succinic acid

GTP is formed during conversion of succinyl CoA $\to$ Succinic acid.
From α-ketoglutaric acid $\to$ Succinyl CoA, there is formation of NADH${}_2$.
From succinic acid $\to$ Malic acid, there is formation of FADH${}_2$.