Among the following , identical the substrate required for the only oxidative reaction that occurs in the process of glucolysis .

Options

A. 3- Phosphoglyceric acid
B. Glyceraldehyde - 3-phosphate
C. Fructose 6-phosphate
D. Glucose 6-phosphate

Answer

To determine the substrate required for the only oxidative reaction that occurs in glycolysis, we need to analyze the steps involved in glycolysis and identify which step involves oxidation.

### 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 consists of several steps, some of which involve oxidation-reduction reactions.

2. **Identifying Oxidative Reactions**: In glycolysis, the only oxidative reaction occurs during the conversion of Glyceraldehyde 3-phosphate (G3P) to 1,3-bisphosphoglycerate. This reaction is catalyzed by the enzyme glyceraldehyde 3-phosphate dehydrogenase.

3. **Substrate for the Oxidative Reaction**: The substrate for this oxidative reaction is Glyceraldehyde 3-phosphate (G3P). In this step, G3P is oxidized, and NAD+ is reduced to NADH.

4. **Eliminating Other Options**:
- 3-phosphoglyceric acid does not involve oxidation.
- Fructose 6-phosphate undergoes isomerization and does not involve oxidation.
- Glucose 6-phosphate is converted to fructose 6-phosphate and does not involve oxidation.

5. **Conclusion**: Therefore, the substrate required for the only oxidative reaction in glycolysis is Glyceraldehyde 3-phosphate (G3P).

### Final Answer:
The substrate required for the only oxidative reaction in glycolysis is **Glyceraldehyde 3-phosphate (G3P)**.

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