If glucose-fed yeast cells are transferred from aerobic environment to anaerobic one, the rate of glucose consumption will

Options

A. Decrease
B. Increase
C. Alter, depending on concentration of other nutrients
D. Will not change

Answer

### Step-by-Step Solution:

1. **Understanding Aerobic Respiration**: In an aerobic environment, yeast cells metabolize glucose using oxygen. This process results in the complete breakdown of glucose into carbon dioxide and water, producing a significant amount of energy (approximately 38 ATP molecules per glucose molecule).

2. **Understanding Anaerobic Respiration**: When yeast cells are transferred to an anaerobic environment (absence of oxygen), they switch to anaerobic respiration, specifically fermentation. In this process, glucose is partially broken down into ethanol and carbon dioxide, yielding only 2 ATP molecules per glucose molecule.

3. **Comparison of Energy Yield**: The energy yield in aerobic respiration (38 ATP) is much higher than in anaerobic respiration (2 ATP). This means that when yeast cells are in an anaerobic environment, they are less efficient at extracting energy from glucose.

4. **Rate of Glucose Consumption**: To compensate for the lower energy yield in anaerobic conditions, yeast cells increase their rate of glucose consumption. This is because they need to consume more glucose to produce enough ATP to meet their energy needs.

5. **Conclusion**: Therefore, when glucose-fed yeast cells are transferred from an aerobic environment to an anaerobic one, the rate of glucose consumption will increase.

### Final Answer:
The rate of glucose consumption will increase when glucose-fed yeast cells are transferred from an aerobic environment to an anaerobic one.

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