Oxidation of Glucose In Absense of Oxygen, Produce CO2? TPR Test 3, Bio Q 10

Discussion in 'MCAT Study Question Q&A' started by 0938h4gt983, Jun 15, 2008.

  1. 0938h4gt983

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    TPR says that only ATP is made from the oxidation of glucose in anaerobic conditions, but on pg. 27 of the bio manual it says that CO2 is produced during fermentation which happens when glucose is oxidized anaerobically.
    I don't get it?
     
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  3. cwfergus

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    Glycolysis is the same process whether anaerobically or aerobically done.
    During glycolysis, you create 4 ATP but use up 2 ATP, thus a net of 2 ATP.

    Now at this stage you are left with 2 pyruvate and 2 NADH.

    if it is anaerobic respiration, this pyruvate must go somewhere, so two things can happen, lactic acid and alcohol fermentation.

    In alcohol fermentation, the pyruvate is reduced (turning NADH back to NAD+) which then turns it into ethanol.

    BUT if it is lactic acid fermentation, a CO2 group is removed, and it is reduced to turn from acetydehyde to lactic acid.

    So This is what it was meaning (there is NO ATP produced after glycolysis if it is anaerobic)
     
  4. 0938h4gt983

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    is fermentation not considered a part of glucose oxidation?
     
  5. cwfergus

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    Its considered a part of anaerobic glucose oxidation
     
  6. lilpucal0v3r

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    In prep 101, it says the fermentation of glucose to ethanol
    a. results in the evolution of 2 co2
    c. does not evolve co2

    answer is c

    according to wiki, pyruvate is cleaved to co2 and acetylaldehyde then acetylaldehyde becomes co2. can someone confirm to me this answer is wrong?
     
  7. BilalL

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    Thats wrong for sure. Only lactic acid fermentation doesn't evolve a gas.
     
  8. notbobtrustme

    notbobtrustme Crux Terminatus
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    pyrvuate goes from 3 carbon sugar to 2 carbon alcohol in alcohol fermentation. that carbon has to go somewhere and it's released as CO2.
     
  9. Morsetlis

    Morsetlis I wish I were a dentist

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