Question

How does aerobic and anaerobic respiration compare in yeast?

Answer 1

Aerobic respiration mostly occurs only in the presence of oxygen, that is the reaction is carried out in the presence of oxygen such a condition is known as an aerobic respiration condition. Whereas in anaerobic respiration the respiration process will take place in the absence of oxygen with release of very less amount of energy than aerobic respiration.
All the reactions undergoing anaerobic respiration occur in the absence of oxygen in most of the respiration processes of yeast anaerobic respiration are observed.

Complete answer:
Anaerobic respiration in yeast requires no oxygen molecules it will mostly takes place in the cytoplasm
It also undergoes a glycolysis process where it shows the breaking of glucose molecules into the simple molecule and during this process the ATP which is yielded is with 4ATP and that is a very less amount of energy is released because there are no oxygen molecules in the reaction.
During this reaction as there is a very less absorption and release glucose molecules are not completely the anaerobic respiration of yeast produce ethanol and carbon dioxide, ethanol is produced as a result of absence of oxygen molecules.
In the yeast anaerobic respiration that will occur during the starting of the respiration process that is at the beginning of the fermentation process.
Due to the extreme solubility of water the aerobic respiration is limited to the starting or initial stages of the formation process and also when yeast is alive it contains both sugar and oxygen molecules in such conditions aerobic respiration is continued.
During those conditions, yeast cells containing glucose in the presence of oxygen produce energy. If the yeast is dead or it is not breathing then in the absence of oxygen the reaction it shows anaerobic.
Anaerobic respiration is a second choice of aerobic respiration because the ethanol which is formed is an alcohol and the alcohol is toxic to yeast cells but this process is mostly used to make wine.

Note: Aerobic, anaerobic respiration are both seen in the yeast but the difference is aerobic respiration is possible when the yeast is not breathing that is in the absence of oxygen in such condition it produce ethanol and carbon dioxide where is ethanol it is an alcohol this alcohol is toxic
But this method is mostly used in many industries to produce the required product such as wine but if the yeast is alive and breathing which shows the presence of oxygen then it undergoes aerobic respiration to produce carbon dioxide water with release of a large amount of energy.