Which one is false for glycolysis?

Options

A. Substrate level phosphorylation occurs
B. The end products are `CO_(2)andH_(2)O`
C. ATP is formed
D. ATP is used

Answer

### Step-by-Step Solution:

1. **Understanding Glycolysis**: Glycolysis is a metabolic pathway that converts glucose into pyruvate, producing ATP and NADH in the process. It occurs in the cytoplasm of the cell and consists of a series of enzymatic reactions.

2. **Analyzing the Options**:
- **Option 1**: "Substrate level phosphorylation occurs."
- In glycolysis, substrate-level phosphorylation does occur. ATP is generated directly in two steps:
- Conversion of 1,3-bisphosphoglycerate to 3-phosphoglycerate.
- Conversion of phosphoenolpyruvate to pyruvate.
- Therefore, this statement is **true**.

- **Option 2**: "The end products are CO2 and H2O."
- The end products of glycolysis are two molecules of pyruvate, not CO2 and H2O. CO2 and H2O are produced in later stages of cellular respiration (like the Krebs cycle and oxidative phosphorylation), not in glycolysis itself.
- Therefore, this statement is **false**.

- **Option 3**: "ATP is formed."
- Glycolysis results in the formation of ATP through substrate-level phosphorylation. A net gain of 2 ATP molecules occurs (4 ATP produced minus 2 ATP used).
- Therefore, this statement is **true**.

- **Option 4**: "ATP is used."
- During glycolysis, 2 ATP molecules are consumed in the initial steps to convert glucose to fructose-1,6-bisphosphate.
- Therefore, this statement is **true**.

3. **Conclusion**: The only false statement regarding glycolysis is **Option 2**, which claims that the end products are CO2 and H2O. The correct end products are pyruvate molecules.

### Final Answer:
The false statement for glycolysis is **Option 2: The end products are CO2 and H2O.**

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