NADH is oxidised to `NAD^(+)` in

Options

A. Aerobic respiration
B. EMP pathway
C. Fermentation
D. More than one option is correct

Answer

To determine in which processes NADH is oxidized to NAD⁺, we can analyze the different options provided:

### Step 1: Understand the Processes
1. **Aerobic Respiration**: This process involves the complete oxidation of glucose in the presence of oxygen, resulting in the production of ATP, water, and carbon dioxide. During this process, NADH is generated and later oxidized back to NAD⁺ in the electron transport chain (ETC).

2. **EMP Pathway (Embden-Meyerhof-Parnas pathway)**: This is the glycolytic pathway where glucose is broken down into pyruvate. In this pathway, NAD⁺ is reduced to NADH, not the other way around.

3. **Fermentation**: This is an anaerobic process that occurs when oxygen is not available. In fermentation, NADH is typically oxidized back to NAD⁺ to allow glycolysis to continue, thus producing energy in the absence of oxygen.

4. **More than one option is correct**: This option suggests that there are multiple processes where NADH is oxidized to NAD⁺.

### Step 2: Analyze Each Option
- **Option A: Aerobic Respiration**: Correct. NADH is oxidized to NAD⁺ during the electron transport chain.
- **Option B: EMP Pathway**: Incorrect. NADH is produced, not oxidized, in this pathway.
- **Option C: Fermentation**: Correct. NADH is oxidized to NAD⁺ during fermentation to regenerate NAD⁺ for glycolysis.
- **Option D: More than one option is correct**: Correct, as both aerobic respiration and fermentation involve the oxidation of NADH to NAD⁺.

### Conclusion
The correct answer is **Option D: More than one option is correct**, as NADH is oxidized to NAD⁺ in both aerobic respiration (specifically in the electron transport chain) and fermentation.

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