Which one of the following is the link between glycolysis and Krebs cycle?

Options

A. Acetyl coenzyme A
B. Phosphoenolpyruvic acid
C. Citric acid
D. Acetyl acetic acid

Explanation

**Step-by-Step Solution:**

1. **Understanding Glycolysis**: Glycolysis is the first step of cellular respiration that occurs in the cytoplasm of the cell. It breaks down glucose into two molecules of pyruvate, producing a small amount of ATP and NADH in the process.

2. **Identifying the Product of Glycolysis**: The final product of glycolysis is pyruvate. This molecule is crucial as it serves as a precursor for the next stage of cellular respiration.

3. **Link to Krebs Cycle**: Pyruvate cannot directly enter the Krebs cycle. Instead, it must first be converted into a different molecule. This conversion involves the removal of a carbon atom (in the form of carbon dioxide) and the addition of coenzyme A.

4. **Formation of Acetyl CoA**: The conversion of pyruvate to acetyl coenzyme A (acetyl CoA) is a critical step that links glycolysis to the Krebs cycle. Acetyl CoA then enters the Krebs cycle, where it is further oxidized to produce energy.

5. **Conclusion**: Therefore, the correct answer to the question of which molecule serves as the link between glycolysis and the Krebs cycle is acetyl coenzyme A.

**Final Answer**: Acetyl coenzyme A

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