After glycolysis, first step of ethyl alochol fermentation requires

Options

A. Dehydrogenation
B. Decarboxylation
C. FAD reduction
D. `Mn^(+2)` acceptance

Answer

To solve the question regarding the first step of ethyl alcohol fermentation after glycolysis, we can break it down into a series of logical steps:

### Step-by-Step Solution:

1. **Understanding Glycolysis**:
- Glycolysis is the metabolic pathway that converts glucose into pyruvic acid, producing ATP and NADH in the process. The end product of glycolysis is pyruvic acid.

2. **Recognizing the Context of Fermentation**:
- Ethyl alcohol fermentation occurs in the absence of oxygen (anaerobic conditions). It is a process that converts pyruvic acid into ethyl alcohol (ethanol).

3. **Identifying the Steps of Alcoholic Fermentation**:
- Alcoholic fermentation consists of two main steps:
- The first step involves the conversion of pyruvic acid into acetaldehyde and carbon dioxide (CO2).
- The second step involves the reduction of acetaldehyde to ethanol.

4. **First Step Details**:
- In the first step, pyruvic acid is decarboxylated, meaning that a carboxyl group (COO-) is removed, releasing CO2. This reaction is catalyzed by the enzyme pyruvate decarboxylase.

5. **Role of Magnesium Ions**:
- Magnesium ions are required as a cofactor for the enzyme pyruvate decarboxylase to function properly.

6. **Conclusion**:
- The question asks for what is required in the first step of ethyl alcohol fermentation after glycolysis. The correct answer is **decarboxylation**, as this is the process that occurs to convert pyruvic acid into acetaldehyde.

### Final Answer:
The first step of ethyl alcohol fermentation after glycolysis requires **decarboxylation**.