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Antibiotics

Antibiotics
At acidic pH, penicillin remains in

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

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Antibiotics
The yield of the antibiotic depends upon

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

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

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

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

all of these
wheat seeds
barley seeds
rice seeds

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

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

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

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

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