How can one tell if the carbon dioxide produced by yeast comes from respiration or fermentation?

Question:

How can one tell if the carbon dioxide produced by yeast comes from respiration or fermentation?

Fermentation in Yeast:

Yeast is a kind of fungi that is capable of respiring both aerobically or anaerobically. It relies on aerobic respiration in the presence of oxyegn; and on anaerobic respiration in the absence of oxygen. In both cases, one of the products is carbon dioxide.

Answer and Explanation:

If you are carrying out this experiment in the lab and the experiment is not sealed and exposed to air then more than likely the yeast are respiring...

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Cellular Respiration in Yeast

from General Studies Biology: Help & Review

Chapter 4 / Lesson 6
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