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Antibiotics

Antibiotics
At normal pH, penicillin remains in

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

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Antibiotics
Inoculum preparation for the fermentation medium for penicillin takes place on

all of these
barley seeds
rice seeds
wheat seeds

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

Phenyl acetic acid
Phenyl carbamic acid
Ammonium chloride
Ammonium sulphate

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Antibiotics
Penicillin is recovered after fermentation as

sodium penicillin
calcium penicillin
penicillin only
potassium penicillin

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

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

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

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

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