When yeast cells are O_{2} starved, fermentation serves as the source of energy. This results in the production of:

  1. A. ATP+CO_{2}+\text{Ethanol}
  2. B. ATP+O_{2}+\text{Pyruvate}
  3. C. ATP+CO_{2}+\text{Lactic acid}
  4. D. ATP+O_{2}+\text{Acetaldehyde}

Correct Answer: A. ATP+CO_{2}+\text{Ethanol}

Explanation

Under anaerobic conditions (oxygen starvation), yeast undergoes alcoholic fermentation, converting pyruvate into ATP, carbon dioxide, and ethanol.

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