In Kreb's cycle OAA accepts acetyl CoA to form

Options

A. Citric acid
B. Oxalosuccinate
C. Fumarate
D. Succinyl CoA

Answer

**Step-by-Step Solution:**

1. **Understanding the Krebs Cycle:** The Krebs cycle, also known as the citric acid cycle or tricarboxylic acid (TCA) cycle, is a crucial metabolic pathway that occurs in aerobic organisms. It is responsible for generating energy through the oxidation of acetyl-CoA derived from carbohydrates, fats, and proteins.

2. **Role of Pyruvate:** Before entering the Krebs cycle, pyruvate, which is produced during glycolysis, is converted into acetyl-CoA. This conversion is essential as acetyl-CoA is the molecule that enters the Krebs cycle.

3. **Oxaloacetic Acid (OAA):** In the Krebs cycle, oxaloacetic acid (OAA) is a four-carbon molecule that plays a key role in the cycle. It is the starting point for the cycle and is regenerated at the end of the cycle.

4. **Formation of Citric Acid:** When acetyl-CoA enters the Krebs cycle, it combines with oxaloacetic acid (OAA) to form citric acid (also known as citrate). This reaction is catalyzed by the enzyme citrate synthase.

5. **Conclusion:** Therefore, in the Krebs cycle, oxaloacetic acid (OAA) accepts acetyl-CoA to form citric acid, which is the first product of the cycle.

**Final Answer:** In the Krebs cycle, OAA accepts acetyl-CoA to form citric acid.

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