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Antibiotics

Antibiotics
At normal pH, penicillin remains in

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

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

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

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

rice seeds
all of these
barley seeds
wheat seeds

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Antibiotics
pH of the fermentation medium for chlorotetracyclins is

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

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Antibiotics
High yield of chlorotetracyclin requires

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

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

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

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