Q103 / 270 · NDA 2023 (Phase 1) · General Ability

When yeast cells are $\mathrm{O}_2$ starved, fermentation serves as the source of energy. This results in the production of :

  • Correct answer
    A
    $\mathrm{ATP}+\mathrm{CO}_2+$ Ethanol
  • B
    $\mathrm{ATP}+\mathrm{O}_2+$ Pyruvate
  • C
    $\mathrm{ATP}+\mathrm{CO}_2+$ Lactic acid
  • D
    $\mathrm{ATP}+\mathrm{O}_2+$ Acetaldehyde

Solution

During fermentation, yeast cells convert cerealderived sugars into ethanol and $\mathrm{CO}_2$. This anaerobic reaction can be written as, $\begin{aligned} & \text { Carbohydrate------Yeast--------} \rightarrow \text { Ethanol }+\mathrm{CO}_2+ \\ & \text {ATP }\end{aligned}$ At the same time, hundreds of secondary metabolites that influence the aroma and taste of beer are produced.

Hence, the correct answer is option: 'A'.

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