Yeast is a unicellular fungus that is capable of both aerobic and anaerobic cellular respiration depending on the availability of oxygen. Yeast undergoes aerobic respiration in the presence of oxygen but undergoes fermentation (anaerobic) in the absence of oxygen.
However, like every other organism, yeast undergoes aerobic cellular respiration to yield CARBON DIOXIDE (CO2) AND WATER (H2O) as products.
