Question

What is fermentation? In yeasts , after respiration what is the by product?

Answer 1

Ever wonder how yeast ferment barley malt into beer? Or how your muscles keep working when you're exercising so hard that they're very low on oxygen?

Both of these processes can happen thanks to alternative glucose breakdown pathways that occur when normal, oxygen-using (aerobic) cellular respiration is not possible—that is, when oxygen isn't around to act as an acceptor at the end of the electron transport chain. These fermentation pathways consist of glycolysis with some extra reactions tacked on at the end. In yeast, the extra reactions make alcohol, while in your muscles, they make lactic acid.

Fermentation is a widespread pathway, but it is not the only way to get energy from fuels anaerobically (in the absence of oxygen). Some living systems instead use an inorganic molecule other than \text {O}_2O2​O, start subscript, 2, end subscript, such as sulfate, as a final electron acceptor for an electron transport chain. This process, called anaerobic cellular respiration, is performed by some bacteria and archaea.

In this article, we'll take a closer look at anaerobic cellular respiration and at the different types of fermentation.


Anaerobic cellular respiration

Anaerobic cellular respiration is similar to aerobic cellular respiration in that electrons extracted from a fuel molecule are passed through an electron transport chain, driving \text{ATP}ATPA, T, P synthesis. Some organisms use sulfate (\text {SO}_4^{2-})(SO42−​)left parenthesis, S, O, start subscript, 4, end subscript, start superscript, 2, minus, end superscript, right parenthesis as the final electron acceptor at the end ot the transport chain, while others use nitrate (\text {NO}_{3}^-)(NO3−​)left parenthesis, N, O, start subscript, 3, end subscript, start superscript, minus, end superscript, right parenthesis, sulfur, or one of a variety of other molecules^11start superscript, 1, end superscript.

Answer 2

Here's your answer..

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◆Fermentation is the Metabolic process in which sugar is converted into acids,alcohol or gases in the absence of oxygen.
Fermentation complements with glycolysis and make it possible for ATP to be produced continually even in absence of oxygen.

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◆The product of respiration in Yeast are ethanol and Carbon dioxide and small amount of heat is also released.

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Hope it helps you...