The diagram below shows a large-scale industrial bioreactor used to culture microorganisms for the commercial production of food-related biomolecules.

Describe how the outer water jacket is used to regulate the temperature of the culture medium.
Explain why allowing the internal temperature to rise significantly above the optimum level would lead to a decrease in the rate of product formation.
Explain how the stirring impeller (paddles) helps to maintain a high rate of aerobic respiration in the growing culture.
Identify one variable, other than temperature, that must be kept constant within the bioreactor, and explain the biological consequence of failing to control it.
Name one specific commercial food product or food-industry enzyme produced using this type of bioreactor technology.