The end product of fermentation of molasses by yeast is

Options

A. Acetic acid
B. Methyl alcohol
C. Ethyl alcohol
D. Lactate

Answer

To solve the question regarding the end product of fermentation of molasses by yeast, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Fermentation**:
- Fermentation is an anaerobic process where carbohydrates are broken down in the absence of oxygen.

**Hint**: Remember that fermentation occurs without oxygen and involves the breakdown of sugars.

2. **Identifying the Source**:
- Molasses is a byproduct of sugarcane processing and contains a high concentration of carbohydrates, primarily sucrose.

**Hint**: Molasses is rich in sugars, which are the substrates for fermentation.

3. **Role of Yeast**:
- Yeast, particularly Saccharomyces cerevisiae, is commonly used in fermentation. It secretes enzymes that help in breaking down sucrose into simpler sugars.

**Hint**: Yeast is a key organism in fermentation, breaking down sugars to produce alcohol.

4. **Glycolysis Process**:
- The first step in fermentation is glycolysis, where sucrose is converted into glucose and then into pyruvic acid.

**Hint**: Glycolysis is the initial step in both aerobic and anaerobic respiration.

5. **Anaerobic Conversion**:
- In the absence of oxygen, pyruvic acid undergoes further conversion. It is first converted into acetaldehyde by the enzyme pyruvate decarboxylase.

**Hint**: Pyruvate decarboxylation is crucial in anaerobic conditions.

6. **Final Product Formation**:
- Acetaldehyde is then converted into ethyl alcohol (ethanol) by the enzyme alcohol dehydrogenase. This process also releases carbon dioxide.

**Hint**: The conversion of acetaldehyde to ethanol is the final step in alcoholic fermentation.

7. **Conclusion**:
- The end product of fermentation of molasses by yeast is ethyl alcohol (C2H5OH).

**Hint**: Ethanol is the primary product of alcoholic fermentation, especially from sugar sources like molasses.

### Final Answer:
The end product of fermentation of molasses by yeast is **ethyl alcohol** (C2H5OH).