During electron transport each molecule of NADH produces how many molecules of ATP?

Options

A. 1
B. 2
C. 3
D. 4

Explanation

To solve the question of how many molecules of ATP are produced from one molecule of NADH during electron transport, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Role of NADH**:
- NADH is a key electron carrier in cellular respiration. It is produced during glycolysis, the citric acid cycle, and other metabolic processes.

2. **Electron Transport Chain (ETC)**:
- The electron transport chain is a series of protein complexes located in the inner mitochondrial membrane. It is responsible for the transfer of electrons from NADH and FADH2 to oxygen, leading to ATP production.

3. **Oxidative Phosphorylation**:
- The process of ATP production linked to the electron transport chain is known as oxidative phosphorylation. This occurs when the energy released from the electron transport chain is used to pump protons (H+) across the mitochondrial membrane, creating a proton gradient.

4. **ATP Production from NADH**:
- Each molecule of NADH that enters the electron transport chain results in the production of ATP. Specifically, it is known that one molecule of NADH can produce three molecules of ATP through this process.

5. **Conclusion**:
- Therefore, the answer to the question is that during electron transport, each molecule of NADH produces **three molecules of ATP**.

### Final Answer:
Each molecule of NADH produces **3 molecules of ATP** during electron transport.

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