Fermentation and food biotechnology Quiz
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5 questions, one answer each
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1. Which gas is made when yeast ferments glucose, alongside ethanol?
- A. Methane
- B. Oxygen
- C. Lactic acid
- D. Carbon dioxide
2. Which microorganism is used to make yoghurt?
- A. Lactic acid bacteria
- B. Yeast
- C. Algae
- D. Viruses
3. What is the main gas in biogas?
- A. Oxygen
- B. Carbon monoxide
- C. Methane
- D. Hydrogen
4. Why are industrial fermenters stirred and kept at a controlled temperature?
- A. To kill the microorganisms
- B. To keep conditions even and best for growth
- C. To stop the product forming
- D. To make the tank heavier
5. Why is bioethanol described as nearly carbon neutral?
- A. It does not burn
- B. It contains no carbon
- C. It is made without any energy
- D. The carbon dioxide released was taken in by the sugar cane as it grew