Primary acceptor of TCA cycle is

Options

A. OAA
B. Acetyl CoA
C. Citric acid
D. Pyruvic acid

Answer

**Step-by-Step Solution:**

1. **Understanding the TCA Cycle**: The TCA cycle, also known as the Krebs cycle, is a crucial metabolic pathway that plays a key role in cellular respiration. It is responsible for the production of energy through the oxidation of acetyl-CoA derived from carbohydrates, fats, and proteins.

2. **Identifying the Primary Acceptor**: In the TCA cycle, the primary acceptor molecule is essential for initiating the cycle. This molecule combines with acetyl-CoA to start the cycle.

3. **Recognizing Oxaloacetic Acid**: The primary acceptor in the TCA cycle is oxaloacetic acid (OAA). It reacts with acetyl-CoA to form citrate, which is the first product of the cycle.

4. **Formation of Citrate**: When acetyl-CoA combines with oxaloacetic acid, it undergoes a condensation reaction to form citrate. This step is catalyzed by the enzyme citrate synthase.

5. **Conclusion**: Therefore, the primary acceptor of the TCA cycle is oxaloacetic acid.

**Final Answer**: The primary acceptor of the TCA cycle is oxaloacetic acid.

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