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Antibiotics

Antibiotics
Chlorotetracyclin is soluble in

ether
water
all of these
organic solvents

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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
Fermentation medium for oxytetracyclin (terramycin) consist of

CSL,(NH4)2 SO4, ammonium chloride and CaCO3
CSL, starch, (NH4)2 SO4, sodium chloride and CaCO3
CSL, (NH4)2 SO4, sodium chloride and CaCO3
CSL, starch,(NH4)2 SO4, ammonium chloride and CaCO3

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Antibiotics
Media used for the production of chlorotetracyclin consists of

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

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Antibiotics
Which of the following organism(s) produce(s) tetracycline?

Nocardia sulphurea
All of these
Steptomyces aureofaciens
Steptomyces ramosus

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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
antibiotic yields are generally higher when cells enter the stationary phase
the precursors are often toxic to the cells

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