In the Krebs cycle, substrate-level phosphorylation accompanies the formation of:

Explanation

In the Krebs cycle, also known as the citric acid cycle, the formation of succinate involves a series of chemical reactions, and substrate-level phosphorylation does not take place during the conversion of succinyl-CoA to succinate. The specific step where substrate-level phosphorylation occurs in the Krebs cycle is during the conversion of succinyl-CoA to succinate. In this step, the enzyme succinyl-CoA synthetase is involved, and it catalyzes the transfer of a phosphate group from succinyl-CoA to ADP, producing ATP and succinate. The overall reaction is as follows: Succinyl-CoA + ADP + Pi (inorganic phosphate) → Succinate + ATP