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Antibiotics

Antibiotics
At acidic pH, penicillin remains in

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

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Antibiotics
Media used for the production of chlorotetracyclin consists of

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

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Antibiotics
Penicillin is recovered after fermentation as

sodium penicillin
potassium penicillin
penicillin only
calcium penicillin

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Antibiotics
Fermentation medium for oxytetracyclin (terramycin) consist of

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

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

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

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Antibiotics
High yield of chlorotetracyclin requires

no aeration
controlled aeration
aeration which does not affect the yield
continuous aeration

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