In certain biochemical reactions two redox-equivalents are removed in the form of two hydrogen atoms from PGAL and transferred to a molecule of `NAD^(+)` and NADH + `H^(+)` is formed. This NADH + `H^(+)` is finally reoxidised in :-

Options

A. Stroma of chloroplast
B. `F_(0)-F_(1)`
C. Mitochondrial matrix
D. Inner mitochondrial membrane

Answer

To answer the question regarding the reoxidation of NADH + H⁺ formed from PGAL, we can break down the process step by step:

### Step-by-Step Solution:

1. **Understanding the Reaction**: In the biochemical reaction mentioned, phosphoglyceraldehyde (PGAL) undergoes a redox reaction where two hydrogen atoms are removed. This process involves the transfer of electrons and protons.

2. **Formation of NADH + H⁺**: The two hydrogen atoms removed from PGAL are transferred to NAD⁺ (Nicotinamide adenine dinucleotide), resulting in the formation of NADH + H⁺. This indicates that NAD⁺ has been reduced to NADH.

3. **Role of NADH + H⁺**: The NADH + H⁺ produced acts as an electron carrier. In cellular respiration, it plays a crucial role in transferring electrons to the electron transport chain (ETC).

4. **Reoxidation of NADH + H⁺**: The NADH + H⁺ is reoxidized in the electron transport chain (ETC). This occurs in the inner mitochondrial membrane, where NADH donates electrons to the chain.

5. **Final Electron Acceptors**: In the electron transport chain, the electrons from NADH are ultimately transferred to molecular oxygen (O₂), which combines with protons to form water (H₂O). This step is essential for aerobic respiration.

6. **Conclusion**: Therefore, the NADH + H⁺ formed from PGAL is finally reoxidized in the electron transport chain (ETC).

### Final Answer:
The NADH + H⁺ is finally reoxidized in the Electron Transport Chain (ETC).

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