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Antibiotics

Antibiotics
At normal pH, penicillin remains in

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

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Antibiotics
Media used for the production of chlorotetracyclin consists of

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

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

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

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Antibiotics
High yield of chlorotetracyclin requires

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

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Antibiotics
Chlorotetracyclin is soluble in

water
all of these
ether
organic solvents

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

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

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