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Antibiotics

Antibiotics
Streptomycin is produced by

S. griseus
S. griseoflavus
S. ramosus
S. aerofaciens

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

Concentration of antibiotic increases in the medium
Slight rise in pH due to liberation of ammonia
Autolysis of the medium starts
All of these

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

Nocardia sulphurea
Steptomyces ramosus
All of these
Steptomyces aureofaciens

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Antibiotics
Chlorotetracyclin is soluble in

water
organic solvents
ether
all of these

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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
Fermentation medium for oxytetracyclin (terramycin) consist of

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

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