Anaerobic respiration in yeast yields

Options

A. (a) Ethanol and `CO_2`
B. (b) Lactic acid and `O_2`
C. (c) `CO_2` and water
D. (d) Pyruvic acid and `O_2`

Answer

**Step-by-Step Solution:**

1. **Understanding Anaerobic Respiration**: Anaerobic respiration occurs in the absence of oxygen. It is a metabolic process that allows cells to generate energy without using oxygen.

2. **Identifying the Organism**: In this case, we are focusing on yeast, which is a common organism that undergoes anaerobic respiration.

3. **Recognizing the Process**: During anaerobic respiration in yeast, glucose is broken down to produce energy. The process involves glycolysis, where glucose is converted into pyruvate.

4. **Conversion of Pyruvate**: In the absence of oxygen, the pyruvate produced from glycolysis is further converted into acetaldehyde and then into ethanol. This process also releases carbon dioxide (CO2).

5. **End Products**: The end products of anaerobic respiration in yeast are ethanol (alcohol) and carbon dioxide (CO2).

6. **Conclusion**: Therefore, the correct answer to the question about what anaerobic respiration in yeast yields is ethanol and carbon dioxide.

**Final Answer**: Anaerobic respiration in yeast yields ethanol and carbon dioxide.

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