Question
Yeast is placed in a sugar solution in a sealed flask. What changes to the environment of the flask would support the claim that the yeast is performing anaerobic respiration?
Options
Decreasing CO2, increasing glucose, and stable oxygen
Increasing CO2, decreasing glucose, and stable oxygen
Stable CO2, decreasing glucose, and increasing oxygen
Increasing CO2, increasing glucose, and decreasing oxygen
Options
Decreasing CO2, increasing glucose, and stable oxygen
Increasing CO2, decreasing glucose, and stable oxygen
Stable CO2, decreasing glucose, and increasing oxygen
Increasing CO2, increasing glucose, and decreasing oxygen
Answers
GPT-4o mini
To support the claim that yeast is performing anaerobic respiration, we would expect the following changes in the environment of the flask:
- **Increasing CO2**: Anaerobic respiration in yeast leads to the production of carbon dioxide as a byproduct. Therefore, if CO2 levels are increasing, it indicates that yeast is metabolizing and producing CO2, which is characteristic of anaerobic respiration.
- **Decreasing glucose**: During anaerobic respiration, yeast consumes glucose for energy. Thus, the glucose level would decrease as yeast metabolizes it.
- **Decreasing oxygen**: Anaerobic respiration occurs in the absence of oxygen. If oxygen levels are decreasing, it supports the concept that the yeast is utilizing anaerobic pathways rather than aerobic ones.
Given this reasoning, the correct option that reflects these changes is:
**Increasing CO2, decreasing glucose, and decreasing oxygen.**
However, since this exact option is not provided in your list, the best choice considering the context of anaerobic respiration from the given options would be:
**Increasing CO2, increasing glucose, and decreasing oxygen.**
The presence of increasing glucose would typically indicate fermentation (anaerobic respiration) has begun, but it should actually be decreasing during the process. Therefore, the best conclusion from the options is still emphasizing the increase in CO2 and decrease in oxygen, which aligns with the occurrence of anaerobic respiration in yeast.
- **Increasing CO2**: Anaerobic respiration in yeast leads to the production of carbon dioxide as a byproduct. Therefore, if CO2 levels are increasing, it indicates that yeast is metabolizing and producing CO2, which is characteristic of anaerobic respiration.
- **Decreasing glucose**: During anaerobic respiration, yeast consumes glucose for energy. Thus, the glucose level would decrease as yeast metabolizes it.
- **Decreasing oxygen**: Anaerobic respiration occurs in the absence of oxygen. If oxygen levels are decreasing, it supports the concept that the yeast is utilizing anaerobic pathways rather than aerobic ones.
Given this reasoning, the correct option that reflects these changes is:
**Increasing CO2, decreasing glucose, and decreasing oxygen.**
However, since this exact option is not provided in your list, the best choice considering the context of anaerobic respiration from the given options would be:
**Increasing CO2, increasing glucose, and decreasing oxygen.**
The presence of increasing glucose would typically indicate fermentation (anaerobic respiration) has begun, but it should actually be decreasing during the process. Therefore, the best conclusion from the options is still emphasizing the increase in CO2 and decrease in oxygen, which aligns with the occurrence of anaerobic respiration in yeast.