One turn of Krebs' cycle produces

Options

A. 1 `FADH_2`, 1 NADH and 1 ATP
B. 1 `FADH_2`, 2 NADH and 1 ATP
C. 1 `FADH_2`, 3 NADH and 1 ATP
D. 2 `FADH_2`, 2 NADH and 2 ATP

Answer

To answer the question "One turn of Krebs' cycle produces," we need to analyze the outputs of one complete cycle of the Krebs cycle (also known as the citric acid cycle).

### Step-by-Step Solution:

1. **Understanding the Krebs Cycle**: The Krebs cycle is a series of chemical reactions used by all aerobic organisms to generate energy. It takes place in the mitochondria and is a key part of cellular respiration.

2. **Identifying the Products**: During one turn of the Krebs cycle, several important molecules are produced:
- **NADH**: This is a reduced form of NAD+ and is an important electron carrier. For one turn of the Krebs cycle, **3 NADH** molecules are produced.
- **FADH2**: This is another electron carrier, produced in the Krebs cycle. For one turn, **1 FADH2** molecule is produced.
- **ATP (or GTP)**: The Krebs cycle also produces **1 ATP** (or GTP, which is equivalent in energy terms) per turn.

3. **Summarizing the Outputs**: Therefore, the outputs of one turn of the Krebs cycle can be summarized as:
- **3 NADH**
- **1 FADH2**
- **1 ATP**

4. **Comparing with Options**: Now, we compare our findings with the provided options:
- Option A: 1 FADH2, 1 NADH, and 1 ATP
- Option B: 1 FADH2, 2 NADH, and 1 ATP
- Option C: 1 FADH2, 3 NADH, and 1 ATP
- Option D: 2 FADH2, 2 NADH, and 2 ATP

The correct match based on our findings is **Option C: 1 FADH2, 3 NADH, and 1 ATP**.

### Conclusion:
Thus, the answer to the question "One turn of Krebs' cycle produces" is **Option C: 1 FADH2, 3 NADH, and 1 ATP**.

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