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Antibiotics

Antibiotics
At normal pH, penicillin remains in

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

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

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

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Antibiotics
The yield of the antibiotic depends upon

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

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Antibiotics
Which of the following precursor is added in the medium to get penicillin G?

Phenyl carbamic acid
Ammonium chloride
Phenyl acetic acid
Ammonium sulphate

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Antibiotics
Which of the following changes occur during first phase of growth of Penicillium chrysogenum?

Ammonia is liberated in the medium
Growth of mycelia occurs
Lactic acid present in the corn steep liquor is utilized at the maximum rate
All of these

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

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

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