How regularly does anaerobic respiration occur in the cell?

Question

liliakarina · Answer

Certain bacteria, do not require atmospheric oxygej for obtaining energy, but they utilize inorganic oxygenated substances -such as $$SO _{4}^{-2}$$ and $$NO _{3}^{-}$$- that's why they use anaerobic respiration. 
A lot of microorganisms survive inside the intestane of bigger animals, burried deeply in the ground or lakes and oceans sediments.
Products of anaerobic respiration don't neccesarily have to be water or CO2, other substances can also be a result.

anonymous · Answer

ohh...i see thank you for the response

liliakarina · Answer

Sure :)

anonymous · Answer

so is Lactic Acid used instead for the respiration ( if water, CO2 is not used)?

liliakarina · Answer

Yes, it is, in some occassions

anonymous · Answer

wow !!!! gee thanxx :) you're really diligent! i appreciate it!!! :D

liliakarina · Answer

But products, for example, when fermentation occurs, are ethanol and CO2