Enzyme catalysing reduction of acetaldehyde in fermentation is

Options

A. amylase
B. diastase
C. alcohol dehydrogenase
D. decarboxylase

Answer

To answer the question regarding the enzyme that catalyzes the reduction of acetaldehyde in fermentation, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Fermentation**:
- Fermentation is a type of anaerobic respiration that occurs in the absence of oxygen. It involves the conversion of glucose into energy and byproducts without using oxygen.

2. **Role of Glycolysis**:
- The process begins with glycolysis, where glucose is broken down into pyruvate. This step occurs in the cytoplasm and produces a small amount of ATP.

3. **Conversion of Pyruvate**:
- In fermentation, pyruvate is then converted into acetaldehyde. This conversion is facilitated by the enzyme **pyruvate decarboxylase**, which removes a carbon dioxide molecule from pyruvate.

4. **Reduction of Acetaldehyde**:
- The next step involves the reduction of acetaldehyde to ethanol. This is where the key enzyme comes into play. The enzyme responsible for this reduction is **alcohol dehydrogenase**.

5. **Final Product**:
- The end product of this fermentation process is ethanol, which is produced from the reduction of acetaldehyde.

6. **Conclusion**:
- Therefore, the enzyme that catalyzes the reduction of acetaldehyde during fermentation is **alcohol dehydrogenase**.

### Final Answer:
The enzyme catalyzing the reduction of acetaldehyde in fermentation is **alcohol dehydrogenase**.

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