Question
SLPaper 3
The diagram shows an aerated fermenter commonly used in biotechnology.
1.[1]
Outline a reason for inserting steam into the fermenter before fermentation.
Verified
Solution
sterilizes/kills unwanted microorganisms in the fermenter;
2.[1]
Describe how optimal temperature is maintained inside the fermenter.
Verified
Solution
cold water is added to the jacket if the temperature is too high;
3.[3]
Explain how penicillin can be produced in a fermenter.
Verified
Solution
a. takes place in (deep-tank) batch fermenters; b. Penicillium (fungus) is grown on sugar/starch/nutrients; c. penicillin is produced when the nutrients are used up; d. penicillin secreted by the fungus is separated and purified; e. occurs under aerobic conditions/Penicillium is an obligate aerobe;
