Which one of the following statements correctly descibes relationship between the Kreb's cycle and electron transport pathway?

Options

A. The Kreb's cycle release `H^(+)` used by electron transport
B. The electron transport pathway obtains electron from the `CO_(2)` produced by the Kreb's cycle
C. The Kreb's cycle and electron transport pathway, both produse ATP
D. NADH + `H^(+)` produced by Kreb's cycle is used to make ATP by electron transport

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 series of enzymatic reactions that take place in the mitochondria. It is responsible for the oxidation of acetyl-CoA to carbon dioxide and water.

2. **Products of the Krebs Cycle**:
- During the Krebs cycle, high-energy electron carriers such as NADH and FADH2 are produced. These carriers are crucial for the next stage of cellular respiration.

3. **Understanding the Electron Transport Chain (ETC)**:
- The electron transport chain is a series of protein complexes located in the inner mitochondrial membrane. It utilizes the electrons from NADH and FADH2 to create a proton gradient across the membrane.

4. **ATP Production**:
- The energy from the proton gradient generated by the ETC is used to synthesize ATP through a process called oxidative phosphorylation. This is where the majority of ATP is produced during cellular respiration.

5. **Relationship Between the Krebs Cycle and ETC**:
- The Krebs cycle provides the electron carriers (NADH and FADH2) that feed into the electron transport chain. The electrons from these carriers are essential for the functioning of the ETC, which ultimately leads to ATP production.

6. **Conclusion**:
- Therefore, the correct statement that describes the relationship between the Krebs cycle and the electron transport pathway is that the Krebs cycle produces NADH and FADH2, which are then used by the electron transport chain to generate ATP.