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Antibiotics

Antibiotics
At normal pH, penicillin remains in

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

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Antibiotics
Which of the following organism(s) produce(s) tetracycline?

Steptomyces ramosus
All of these
Nocardia sulphurea
Steptomyces aureofaciens

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Antibiotics
At acidic pH, penicillin remains in

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

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

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

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