Net ATPs produced by substrate level phosphorylation when one molecule of fructose is conveed to two molecules of pyruvate?

**Core Concept**
During glycolysis, the conversion of one molecule of fructose to two molecules of pyruvate involves substrate-level phosphorylation, a process where high-energy phosphate groups are directly transferred from one molecule to another, generating ATP.

**Why the Correct Answer is Right**
The key step in glycolysis where substrate-level phosphorylation occurs is the conversion of 1,3-bisphosphoglycerate (1,3-BPG) to 3-phosphoglycerate (3-PG) and the conversion of phosphoenolpyruvate (PEP) to pyruvate. In these reactions, the energy from the high-energy phosphate bonds of 1,3-BPG and PEP is used to drive the production of two ATP molecules.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not take into account the 2 ATP molecules produced in the conversion of 1,3-BPG to 3-PG and the conversion of PEP to pyruvate.
* **Option B:** This option is incorrect because it only accounts for the 2 NADH molecules produced in the conversion of glyceraldehyde-3-phosphate to 1,3-BPG, which is not a substrate-level phosphorylation event.
* **Option C:** This option is incorrect because it does not accurately reflect the number of ATP molecules produced in the conversion of fructose to pyruvate.

**Clinical Pearl / High-Yield Fact**
Glycolysis is a critical pathway for energy production in cells, and understanding the substrate-level phosphorylation events that occur during this process is essential for grasping how cells generate energy from glucose.

**Correct Answer: C. 2**