Do you know any step in the TCA cycle where there is substrate level phosphorylation. Which one?

Explanation

### Step-by-Step Solution:

1. **Understanding the TCA Cycle**: The TCA cycle, also known as the Krebs cycle or citric acid cycle, is a crucial metabolic pathway that occurs in the mitochondria of cells. It involves a series of chemical reactions used by all aerobic organisms to generate energy.

2. **Identifying Substrate Level Phosphorylation**: Substrate level phosphorylation is a process where ATP (or GTP) is produced by the direct transfer of a phosphate group from a substrate to ADP (or GDP). This is different from oxidative phosphorylation, which occurs in the electron transport chain.

3. **Key Reaction in the TCA Cycle**: In the TCA cycle, one specific step involves the conversion of succinyl CoA to succinate. During this reaction, a high-energy phosphate group is transferred to GDP, resulting in the formation of GTP (guanosine triphosphate).

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