The complex concerned with oxidative phosphorylation in inner mitochondral membrane is

Options

A. Complex IV
B. Complex V
C. Complex III
D. Complex II

Answer

**Step-by-Step Solution:**

1. **Understanding Oxidative Phosphorylation**:
- Oxidative phosphorylation is the process by which ATP is produced in the mitochondria. It involves the transfer of electrons through a series of protein complexes in the inner mitochondrial membrane.

2. **Identifying the Complexes**:
- The electron transport chain consists of several complexes: Complex I (NADH dehydrogenase), Complex II (succinate dehydrogenase), Complex III (cytochrome bc1 complex), Complex IV (cytochrome c oxidase), and Complex V (ATP synthase).

3. **Role of Each Complex**:
- Complex I and II are involved in the oxidation of NADH and FADH2, respectively.
- Complex III transfers electrons to cytochrome c.
- Complex IV transfers electrons to oxygen, the final electron acceptor.
- Complex V is responsible for synthesizing ATP from ADP and inorganic phosphate.

4. **Identifying the Correct Complex for Oxidative Phosphorylation**:
- The question asks specifically for the complex involved in oxidative phosphorylation. While Complexes I, II, III, and IV are involved in the electron transport chain, it is Complex V that is responsible for ATP synthesis, which is the end goal of oxidative phosphorylation.

5. **Conclusion**:
- Therefore, the correct answer to the question is Complex V, also known as ATP synthase.

**Final Answer**: Complex V (ATP synthase) is the complex concerned with oxidative phosphorylation in the inner mitochondrial membrane.

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