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Antibiotics

Antibiotics
At acidic pH, penicillin remains in

both (a) and (b)
solvent phase
aqueous phase
precipitates

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Antibiotics
During which phase of growth of Penicillium chrysogenum maximum antibiotic production takes place

during the third phase
during the first phase
same in all the phases
during the second phase

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Antibiotics
Which of the following event occurs during third phase of growth of P chrysogenum?

All of these
Autolysis of the medium starts
Concentration of antibiotic increases in the medium
Slight rise in pH due to liberation of ammonia

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Antibiotics
Vegetable oil, (corn oil or soybean oil) added in the fermentation medium for penicillin, act as

antifoam agent
source of nutrients
both (a) and (c)
carbon source

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Antibiotics
Antibiotics are typically produced in fed batch reactors because

All of these
antibiotic yields are generally higher when cell growth slows
the precursors are often toxic to the cells
antibiotic yields are generally higher when cells enter the stationary phase

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Antibiotics
The yield of the antibiotic depends upon

all of these
pH of the medium
age of the inoculum
composition of the medium

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