IMAT Fermentation questions

Sample questions

1. 1IMAT Doutor

   Facultative anaerobes such as yeast switch to fermentation when oxygen runs out, whereas an obligate aerobe dies. The reason is that the obligate aerobe:
   1. AIs poisoned by the pyruvate it produces, which accumulates without oxygen
   2. BLoses its mitochondria in the absence of oxygen and cannot rebuild them in time
   3. CCannot take up glucose without oxygen, because its transporters need ATP from respiration
   4. DHas no way to regenerate NAD⁺ without the respiratory chain, so glycolysis also stops
   5. ECannot perform glycolysis at all, since it obtains all its ATP from fatty acids
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2. 2IMAT 2025 Q10

   During lactic fermentation, pyruvic acid is:
   1. Aoxidised
   2. Bphosphorylated
   3. Cdecarboxylated
   4. Dreduced
   5. Edephosphorylated
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