True about citric acid cycle

Options

A. 8 ATP molecules are produced
B. Fat soluble vitamins are required
C. Involved in fatty acid synthesis
D. `O_2` is consumed

Answer

### Step-by-Step Solution:

1. **Understanding the Citric Acid Cycle**: The citric acid cycle, also known as the Krebs cycle, is a crucial metabolic pathway that plays a significant role in cellular respiration. It occurs in the mitochondria and is the second step in carbohydrate metabolism.

2. **Analyzing Each Option**:
- **Option A: 8 ATP molecules are produced**: This statement is incorrect. The citric acid cycle does not directly produce 8 ATP molecules. Instead, it produces NADH and FADH2, which are later used in the electron transport chain to generate ATP.

- **Option B: Fat-soluble vitamins are required**: This statement is also incorrect. The citric acid cycle does not require fat-soluble vitamins for its operation. Instead, it primarily involves coenzymes like NAD+ and FAD.

- **Option C: Involved in fatty acid synthesis**: This statement is correct. The citric acid cycle produces acetyl CoA, which is a key precursor for the synthesis of fatty acids and cholesterol.

- **Option D: Oxygen is consumed**: This statement is incorrect. The citric acid cycle itself does not consume oxygen. However, it is part of aerobic respiration, which requires oxygen for the electron transport chain.

3. **Conclusion**: After analyzing all options, the only true statement about the citric acid cycle is **Option C: Involved in fatty acid synthesis**.

### Final Answer:
The correct answer is **Option C: Involved in fatty acid synthesis**.

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