Question

During which of the following steps of the TCA cycle does substrate-level phosphorylation take place?

A) TCA-2
B) TCA-3
C) TCA-4
D) TCA-5
E) TCA-6

Answer 1

During the TCA cycle, substrate-level phosphorylation occurs in TCA-7.

Step-by-step explanation:

During the TCA cycle, substrate-level phosphorylation occurs in TCA-7. In this step, 1,3-bisphosphoglycerate donates a high-energy phosphate to ADP, forming one molecule of ATP. This is an example of substrate-level phosphorylation, where a phosphate group is directly transferred from a substrate molecule to ADP to form ATP.