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Food production

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Question 77

An industrial fermenter (bioreactor) is used to cultivate microorganisms under controlled conditions for large-scale production of biological substances.

An industrial fermenter (bioreactor) showing a cylindrical vessel with a central rotating shaft equipped with stirring paddles. A cooling jacket surrounds the outside of the vessel, with an inlet for cold water at the bottom and an outlet near the top. A temperature and pH probe is inserted into the culture medium and connected to a control unit. Sterile air enters through a filter at the bottom, and a product collection tap is located at the lower end of the vessel.

a.

Explain how the cooling jacket regulates the temperature inside the fermenter.

[2]
b.

Explain why it is crucial to keep the temperature near the optimum level for the growing microorganisms.

[2]
c.

Explain the purpose of the stirring paddles in the fermenter.

[2]
d.

Other than temperature, identify one condition inside the fermenter that must be carefully controlled, and explain the consequence of failing to control it.

[2]
e.

Name one specific commercial or medical product manufactured using this type of bioreactor technology.

[1]

Food production Questions

  1. IGCSE
  2. /Biology
  3. /Food production