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    Hi
    doing biology c.w
    wondering about aerobic and anerobic repsiration in yeast......is it exactly the same as that in humans? i.e are teh same enzymes used e.g. pyruvate dehydrogenase or are they diffrent? Also is it the same as repsiration i.e krebs cycle glycolysis etc?
    Also what level of alcohol (%) is respiration stopped?
    lastly what kind of enzyme inhibition occurs in yeast?
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    No, when yeast respirates anaerobically, ethanol and carbon dioxide are produced

    (when muscle cells respirate anaerobically, lactate is released)
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    yeah but aerobic is the same right?
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    No; in aerobic respiration yeast follows the Krebs' Cycle which occurs in mitochondria where, basically, pyruvate becomes converted to acetyl CoA and is repeatedly oxidised to form carbon dioxide and to power the electron transport chain by transporting H+ ions across the impermeable inner mitochondrial membrane so as to allow ATPase to create ATP by means of a proton motive force.

    In anaerobic respiration, the absence of the final electron acceptor, oxygen, means that there are a buildup of electrons in the ETC, hence the Krebs' Cycle cannot occur. Consequently only glycolysis will occur, and all its related enzymes (kinase, dehydrogenase, aldolase, enolase). There is buildup of pyruvate which is toxic to the cell, hence to remove this the pyruvate is converted to a 2C compound ethanol and carbon dioxide.
 
 
 
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