Which of the following is the product of glucose fermentation by yeast ?

Options

A. `C_(6)H_(12)O_(6)`
B. `C_(2)H_(5)OH`
C. `(C_(6)H_(10)O5)_(n)`
D. `CH_(2)OH`

Answer

**Step-by-Step Solution:**

1. **Understanding Fermentation**: Fermentation is a type of anaerobic respiration that occurs in the absence of oxygen. It is a metabolic process that converts carbohydrates, like glucose, into simpler compounds.

2. **Role of Yeast**: In yeast, glucose fermentation primarily produces ethanol and carbon dioxide. Yeast utilizes an enzyme complex called Zymase to facilitate this process.

3. **Glycolysis**: The fermentation process begins with glycolysis, where one molecule of glucose is broken down into two molecules of pyruvate (pyruvic acid). This step releases 2 ATP (adenosine triphosphate) molecules, which are energy carriers.

4. **Conversion of Pyruvate**: The two pyruvate molecules are then converted into two molecules of acetaldehyde. During this conversion, 2 molecules of carbon dioxide are released.

5. **Formation of Ethanol**: Finally, the two acetaldehyde molecules are converted into two molecules of ethanol (C2H5OH). This step also regenerates NAD+ from NADH, which is essential for the continuation of glycolysis.

6. **Final Product**: Therefore, the main products of glucose fermentation by yeast are ethanol and carbon dioxide, with ethanol being the primary product.

**Final Answer**: The product of glucose fermentation by yeast is ethanol (C2H5OH).

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