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Antibiotics

Antibiotics
At acidic pH, penicillin remains in

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

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Antibiotics
Chlorotetracyclin is soluble in

water
ether
all of these
organic solvents

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Antibiotics
Antibiotics are typically produced in fed batch reactors because

antibiotic yields are generally higher when cell growth slows
All of these
the precursors are often toxic to the cells
antibiotic yields are generally higher when cells enter the stationary phase

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

all of these
rice seeds
barley seeds
wheat seeds

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Antibiotics
Which of the following precursor is added in the medium to get penicillin G?

Ammonium chloride
Ammonium sulphate
Phenyl carbamic acid
Phenyl acetic acid

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

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

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