ATPs generated by `1 NADH_(2)` and `1 FADH_(2)` are, respectively,

Options

A. 3,2
B. 2,3
C. 3,5
D. 5,3

Answer

To solve the question regarding the ATPs generated by 1 NADH2 and 1 FADH2, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Role of NADH2 and FADH2**:
- NADH2 and FADH2 are high-energy electron carriers produced during cellular respiration. They play a crucial role in the electron transport chain (ETC), where they donate electrons.

2. **Electron Transport Chain Mechanism**:
- In the electron transport chain, NADH2 and FADH2 donate electrons to the chain, which leads to the pumping of hydrogen ions (H+) across the inner mitochondrial membrane.

3. **ATP Production from NADH2**:
- Each NADH2 molecule results in the pumping of 3 H+ ions into the intermembrane space. This creates a proton gradient that drives ATP synthesis.
- Therefore, 1 NADH2 generates **3 ATP molecules**.

4. **ATP Production from FADH2**:
- Each FADH2 molecule results in the pumping of 2 H+ ions into the intermembrane space.
- Consequently, 1 FADH2 generates **2 ATP molecules**.

5. **Final Answer**:
- Thus, the ATPs generated by 1 NADH2 and 1 FADH2 are **3 ATP and 2 ATP**, respectively.

### Summary:
- **NADH2** produces **3 ATP**.
- **FADH2** produces **2 ATP**.