Which of the following coenzymes assist enzymatic reduction

Options

A. NADH
B. NADPH
C. `FADH_(2)`
D. All of these

Explanation

To determine which coenzymes assist in enzymatic reduction, we need to analyze the options provided: NADH, NADPH, FADH2, and NADPHS.

### Step-by-Step Solution:

1. **Understanding Coenzymes**: Coenzymes are organic molecules that assist enzymes in catalyzing reactions. They often act as carriers for chemical groups or electrons.

2. **Identifying Reduction**: Enzymatic reduction refers to the process where an enzyme facilitates the gain of electrons or hydrogen atoms by a substrate. This often involves the transfer of electrons from a donor molecule to an acceptor molecule.

3. **Analyzing Each Coenzyme**:
- **NADH**: This coenzyme is involved in redox reactions and acts as an electron carrier. It is reduced to NAD+ when it donates electrons.
- **NADPH**: Similar to NADH, NADPH is also an electron carrier but is primarily involved in anabolic reactions (biosynthesis) and assists in reduction reactions.
- **FADH2**: This coenzyme, like NADH, is involved in redox reactions and can donate electrons, thus facilitating reduction.
- **NADPHS**: This seems to be a typographical error or a misrepresentation of NADPH. Assuming it refers to NADPH, it would also assist in reduction.

4. **Conclusion**: The coenzymes that assist in enzymatic reduction are:
- NADH
- NADPH
- FADH2

### Final Answer:
The coenzymes that assist enzymatic reduction are NADH, NADPH, and FADH2.

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