Exercise: Antibiotics

Questions for: Antibiotics

Which of the following changes occur during first phase of growth of Penicillium chrysogenum?
A:
Growth of mycelia occurs
B:
Ammonia is liberated in the medium
C:
Lactic acid present in the corn steep liquor is utilized at the maximum rate
D:
All of the above
Answer: D
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Vegetable oil, (corn oil or soybean oil) added in the fermentation medium for penicillin, act as
A:
source of nutrients
B:
carbon source
C:
antifoam agent
D:
both (a) and (c)
Answer: C
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Which of the following event occurs during third phase of growth of P chrysogenum?
A:
Concentration of antibiotic increases in the medium
B:
Autolysis of the medium starts
C:
Slight rise in pH due to liberation of ammonia
D:
All of the above
Answer: D
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Antibiotics are typically produced in fed batch reactors because
A:
antibiotic yields are generally higher when cells enter the stationary phase
B:
the precursors are often toxic to the cells
C:
antibiotic yields are generally higher when cell growth slows
D:
All of the above
Answer: D
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Inoculum preparation for the fermentation medium for penicillin takes place on
A:
wheat seeds
B:
barley seeds
C:
rice seeds
D:
all of these
Answer: B
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