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Which of the following option about the fermentation is correct? The incomplete oxidation of glucose is achieved under anaerobic conditions by sets of reactions where pyruvic acid is converted to CO2 and ethanol.  The enzymes, pyruvic acid decarboxylase, and alcohol dehydrogenase catalyze these reactions.

Which of the following option about the fermentation is correct? The incomplete oxidation of glucose is achieved under anaerobic conditions by sets of reactions where pyruvic acid is converted to CO2 and ethanol.  The enzymes, pyruvic acid decarboxylase, and alcohol dehydrogenase catalyze these reactions. Correct Answer Both are correct

The correct answer is 3 i.e. Both are correct.

Fermentation: 

  • In fermentation, the incomplete oxidation of glucose is achieved under anaerobic conditions by sets of reactions where pyruvic acid is converted to CO2 and ethanol. 
  • The enzymes, pyruvic acid decarboxylase, and alcohol dehydrogenase catalyze these reactions. 
  • Other organisms like some bacteria produce lactic acid from pyruvic acid. 
  • In animal cells also, like muscles during exercise, when oxygen is inadequate for cellular respiration pyruvic acid is reduced to lactic acid by lactate dehydrogenase. 
  • The reducing agent is NADH+H+ which is reoxidized to NAD+ in both the processes. 
  • In both lactic acid and alcohol fermentation not much energy is released; less than seven percent of the energy in glucose is released and not all of it is trapped as high energy bonds of ATP. 
  • Also, the processes are hazardous – either acid or alcohol is produced. 

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