. Two different species of bacteria are examined. Scientists find that species X always produces CO2 and H2O during cellular respiration. Species Y always produces ethyl alcohol and CO2. Which conclusion can be made from these observations? (SC.912.L.18.9)

Question

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1 point
Only species Y is aerobic
Only species Y is anaerobic
Both species X and Y are aerobic
Both species X and Y are anaerobic

Answer 1

Based on the observations provided:

• Species X produces CO2 and H2O during cellular respiration, which indicates that it is likely undergoing aerobic respiration, as this process typically involves the complete oxidation of glucose in the presence of oxygen, resulting in CO2 and H2O as end products.

• Species Y produces ethyl alcohol and CO2, which suggests that it is undergoing fermentation (specifically alcoholic fermentation) and does not require oxygen. This is characteristic of anaerobic respiration.

From these observations, we can conclude:

Only species Y is anaerobic.