Which of the following product is formed by Krebs cycle ?

Options

A. Acetyl CoA
B. ADP
C. ATP
D. `NAD^(+)`

Answer

**Step-by-Step Solution:**

1. **Understanding the Krebs Cycle**: The Krebs cycle, also known as the citric acid cycle or TCA cycle, is a crucial part of cellular respiration that occurs in the mitochondria. It processes acetyl-CoA derived from carbohydrates, fats, and proteins to produce energy.

2. **Starting Material**: The cycle begins with acetyl-CoA, which is formed from pyruvic acid (derived from glycolysis). This is an important intermediate but not a product of the Krebs cycle itself.

3. **Products of the Krebs Cycle**: As the Krebs cycle progresses, it generates several key energy-carrying molecules:
- **ATP (Adenosine Triphosphate)**: The cycle produces ATP, which is the primary energy currency of the cell.
- **NADH (Nicotinamide Adenine Dinucleotide)**: The cycle produces NADH, which carries electrons to the electron transport chain.
- **FADH2 (Flavin Adenine Dinucleotide)**: Similar to NADH, FADH2 also carries electrons to the electron transport chain.

4. **Analyzing the Options**:
- **Acetyl-CoA**: This is not a product of the Krebs cycle; it is a substrate that enters the cycle.
- **ATP**: This is indeed a product of the Krebs cycle.
- **ADP**: This is not produced in the Krebs cycle; it is a precursor to ATP.
- **NAD+ (Nicotinamide Adenine Dinucleotide)**: This is not produced; rather, NAD+ is reduced to NADH during the cycle.

5. **Conclusion**: The only product formed by the Krebs cycle from the given options is **ATP**.

**Final Answer**: ATP

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