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Biology · May / June 2020 · Paper 12 · Question 26

5090Biotechnology

The diagram shows some apparatus set up to produce alcohol by fermentation. What is the purpose of the oil layer?

  1. Ato keep the alcohol in the solution
  2. Bto prevent aerobic respiration
  3. Cto produce carbon dioxide
  4. Dto provide nutrients for the yeast

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Correct answer: B. to prevent aerobic respiration

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