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Antibiotics

Antibiotics
At acidic pH, penicillin remains in

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

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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
Growth of mycelia occurs
Lactic acid present in the corn steep liquor is utilized at the maximum rate

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Antibiotics
Fermentation medium for oxytetracyclin (terramycin) consist of

CSL, (NH4)2 SO4, sodium chloride and CaCO3
CSL, starch,(NH4)2 SO4, ammonium chloride and CaCO3
CSL,(NH4)2 SO4, ammonium chloride and CaCO3
CSL, starch, (NH4)2 SO4, sodium chloride and CaCO3

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Antibiotics
At normal pH, penicillin remains in

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

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Antibiotics
The yield of the antibiotic depends upon

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

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Antibiotics
pH of the fermentation medium for chlorotetracyclins is

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

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