The answer explains that anaerobic respiration in animal cells is reversible because the conversion of pyruvate to lactate does not lose atoms. In contrast, that in yeast cells cannot be reversed because the conversion of pyruvate to ethanol releases carbon dioxide, which cannot be recovered.
A resposta explica que a respiração anaeróbica em células animais pode ser revertida porque a conversão de piruvato em lactato não perde átomos. Em contraste, a em células de levedura não pode ser revertida porque a conversão de piruvato em etanol libera dióxido de carbono, que não pode ser recuperado.
| Front | The anaerobic respiration pathway in animal cells can be reversed, but the anaerobic respiration pathway in yeast cells cannot be reversed. Explain why, using your knowledge of the differences between the two pathways. |
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| Back | in animals A1 pyruvate is , converted / reduced , to , lactate / lactic acid ; A2 can be reversed as no , atoms lost / other product formed ; A3 lactate dehydrogenase available to reverse the reaction ; in yeast Y1 pyruvate converted to ethanol (in 2 steps) and carbon dioxide / CO2 ; Y2 cannot be reversed as , carbon dioxide is / atoms are , lost ; Y3 (de)carboxylase enzyme cannot reverse the reaction ; |
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