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A glucose fed yeast cell is moved from a...

A glucose fed yeast cell is moved from an aerobic environment to an anaerobic one. For the cell to continue generating ATP at the same rate, rate of glucose consumption should increase:

A

2 times

B

4 times

C

19 times

D

38 times

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the increase in glucose consumption by a yeast cell when moved from an aerobic to an anaerobic environment, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding the Initial Conditions**: - In an aerobic environment, yeast cells perform cellular respiration using oxygen. This process breaks down glucose to produce carbon dioxide, water, and a significant amount of ATP (energy). - For one molecule of glucose, yeast can generate up to 38 ATP molecules in the presence of oxygen. 2. **Transition to Anaerobic Conditions**: - When the yeast is moved to an anaerobic environment (absence of oxygen), it cannot perform aerobic respiration. - Instead, it undergoes fermentation, which is less efficient in terms of ATP production. 3. **ATP Yield in Anaerobic Conditions**: - During fermentation, the breakdown of glucose results in the production of ethanol and carbon dioxide, along with a much lower yield of ATP. - In anaerobic conditions, the maximum ATP yield from one glucose molecule is only 2 ATP molecules. 4. **Comparing ATP Production**: - In aerobic conditions: 1 glucose → 38 ATP - In anaerobic conditions: 1 glucose → 2 ATP - This shows that the ATP yield drops significantly when oxygen is not present. 5. **Calculating the Increase in Glucose Consumption**: - To maintain the same ATP production level (38 ATP) in anaerobic conditions, the yeast would need to consume significantly more glucose. - Since 1 glucose yields only 2 ATP in anaerobic conditions, to produce 38 ATP, the yeast would need to consume 19 glucose molecules (since 19 x 2 ATP = 38 ATP). 6. **Conclusion**: - Therefore, to continue generating ATP at the same rate in an anaerobic environment, the rate of glucose consumption should increase by approximately 19 times. ### Final Answer: The rate of glucose consumption should increase by 19 times. ---
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