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Antibiotics

Antibiotics
At acidic pH, penicillin remains in

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

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

rice seeds
wheat seeds
barley seeds
all of these

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Antibiotics
Media used for the production of chlorotetracyclin consists of

sugar, corn steep liquor, CaCO3, (NH4)2SO4 and NH4 Cl
corn steep liquor, CaCO3, (NH4)2SO4 and NH4 Cl
corn steep liquor, CaCO3 and (NH4)2SO4
sugar, CaCO3 and (NH4)2SO4

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Antibiotics
pH of the fermentation medium for chlorotetracyclins is

5-6
8-9
6-7
7-8

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

Synthesis of penicillin is high
Both (a) and (b)
Mycelial mass increases
pH increase

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

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

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