Question

Substrate level phosphorylation does not occur in which of the following reaction of aerobic respiration?

• A. $1,3$ -diPGA $\longrightarrow 3-P G A$
• B. $3$-PGA $\longrightarrow 2-P G A$
• C. PEP Pynuvate
• D. Succinyl CoA $\longrightarrow$ Succinic acid

Answer 1

Answer: (B)

Substrate level phosphorylation $\rightarrow$ Direct transfer of a phosphate group from a substrate molecule to ADP to form ATP.
There is no such transfer from $3PGA - 2PGA$. In the phosphate group reshuffling is done here from $3^{\text {rd }}$ position to $2^{\text {nd }}$ position.