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Antibiotics

Antibiotics
Chlorotetracyclin is soluble in

water
all of these
organic solvents
ether

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

Phenyl carbamic acid
Ammonium chloride
Ammonium sulphate
Phenyl acetic acid

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Antibiotics
Vegetable oil, (corn oil or soybean oil) added in the fermentation medium for penicillin, act as

antifoam agent
source of nutrients
carbon source
both (a) and (c)

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Antibiotics
High yield of chlorotetracyclin requires

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

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Antibiotics
At acidic pH, penicillin remains in

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

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Antibiotics
Antibiotics are typically produced in fed batch reactors because

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

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