yeast converts glucose into :

Options

A. starch
B. alcohol
C. lactic acid
D. yogurt

Answer

**Step-by-Step Solution:**

1. **Understanding Yeast Metabolism**: Yeast is a type of fungus that can convert glucose into different products depending on the presence or absence of oxygen.

2. **Anaerobic vs. Aerobic Respiration**:
- In the presence of oxygen (aerobic respiration), yeast converts glucose into carbon dioxide and water, releasing energy.
- In the absence of oxygen (anaerobic respiration), yeast undergoes fermentation.

3. **Fermentation Process**: During fermentation, yeast converts glucose into pyruvate. In the absence of oxygen, this pyruvate is further converted into alcohol (ethanol) and carbon dioxide.

4. **Products of Yeast Fermentation**: The main products of yeast fermentation are:
- Alcohol (ethanol)
- Carbon dioxide
- Energy (in the form of ATP)

5. **Conclusion**: Therefore, when yeast converts glucose, the primary product is alcohol (ethanol).

**Final Answer**: Yeast converts glucose into alcohol (ethanol).

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