In krebs' cycle OA A accepts acteyl CoA to form

Options

A. citric acid
B. oxalosuccinate
C. fumarate
D. succinyl CoA

Answer

To solve the question regarding what oxaloacetic acid forms when it accepts acetyl CoA in the Krebs cycle, we can follow these steps:

### 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 takes place in the mitochondria of cells. It is responsible for the oxidation of acetyl CoA to produce energy.

2. **Role of Oxaloacetic Acid**: Oxaloacetic acid (OAA) is a four-carbon compound that plays a vital role in the Krebs cycle. It is the starting point of the cycle and combines with acetyl CoA to initiate the cycle.

3. **Formation of Citric Acid**: When acetyl CoA (which carries a two-carbon acetyl group) combines with oxaloacetic acid, it forms citric acid (also known as citrate), which is a six-carbon compound. This reaction is catalyzed by the enzyme citrate synthase.

4. **Identifying the Correct Answer**: The question asks what oxaloacetic acid forms when it accepts acetyl CoA. Based on our understanding, the correct answer is citric acid.

5. **Final Answer**: Therefore, the answer to the question is **A - citric acid**.