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Fermentation is carried out by the yeast...

Fermentation is carried out by the yeast cells in the absence of

A

nitrogen

B

carbon dioxide

C

hydrogen

D

oxygen

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding Fermentation**: Fermentation is a metabolic process where microorganisms, such as yeast, convert sugars (carbohydrates) into energy. This process occurs in the absence of oxygen. 2. **Role of Yeast**: Yeast cells are a type of fungus that play a crucial role in fermentation. They contain enzymes that facilitate the breakdown of carbohydrates into simpler compounds, releasing energy in the process. 3. **Absence of Oxygen**: For fermentation to occur, it is essential that oxygen is not present. In the presence of oxygen, yeast would undergo aerobic respiration instead of fermentation, which is a different process that produces more energy. 4. **Chemical Changes**: During fermentation, the yeast cells cause chemical changes in the organic substances (like sugars) they are metabolizing. These changes are primarily due to the action of enzymes produced by the yeast. 5. **Conclusion**: Therefore, the process of fermentation by yeast cells is specifically carried out in the absence of oxygen. ### Final Answer: Fermentation is carried out by yeast cells in the absence of **oxygen**. ---
### Step-by-Step Solution: 1. **Understanding Fermentation**: Fermentation is a metabolic process where microorganisms, such as yeast, convert sugars (carbohydrates) into energy. This process occurs in the absence of oxygen. 2. **Role of Yeast**: Yeast cells are a type of fungus that play a crucial role in fermentation. They contain enzymes that facilitate the breakdown of carbohydrates into simpler compounds, releasing energy in the process. 3. **Absence of Oxygen**: For fermentation to occur, it is essential that oxygen is not present. In the presence of oxygen, yeast would undergo aerobic respiration instead of fermentation, which is a different process that produces more energy. ...
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