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Antibiotics

Antibiotics
Chlorotetracyclin is soluble in

water
ether
all of these
organic solvents

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Antibiotics
Penicillin is recovered after fermentation as

sodium penicillin
penicillin only
potassium penicillin
calcium penicillin

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

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

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Antibiotics
At normal pH, penicillin remains in

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

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Antibiotics
High yield of chlorotetracyclin requires

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

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

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

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