In an experiment observing yeast respiration, Douglas notes that during the first day, carbon dioxide was produced. After three days, alcohol was produced. Which statement below would explain these results?
A) The yeast cells were going through aerobic respiration for the first two days of the experiment then the cells switched to anaerobic respiration when the available oxygen was gone from the vessel.
B) The alcohol is formed from decaying yeast cells. Three days is the normal life span of a yeast cell.
C) It took three days for the yeast cells to finish a fermentation cycle to produce the alcohol.
D) Alcohol is formed from carbon dioxide when present with yeast, and the concentration of carbon dioxide had to be high enough for that reaction to occur.
Ans: A) The yeast cells were going through aerobic respiration for the first two days of the experiment then the cells switched to anaerobic respiration when the available oxygen was gone from the vessel.
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