ANTIBIOTICS QUIZ

soybean meal, glucose, peptone, malt extract, ammonium sulphate

soybean meal, glucose, peptone, malt extract, sodium chloride

soybean meal, glucose, peptone, malt extract, calcium carbonate

soybean meal, glucose, peptone, malt extract, ammonium chloride

Growth of mycelia occurs

Ammonia is liberated in the medium

All of these

Lactic acid present in the corn steep liquor is utilized at the maximum rate

both (a) and (b)

aqueous phase

precipitates

solvent phase

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

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

Concentration of antibiotic increases in the medium

Slight rise in pH due to liberation of ammonia

Autolysis of the medium starts

All of these

corn steep liquor, CaCO3 and (NH4)2SO4

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

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

sugar, CaCO3 and (NH4)2SO4

6-7

7-8

5-6

8-9

sodium penicillin

potassium penicillin

penicillin only

calcium penicillin

antibiotic yields are generally higher when cell growth slows

the precursors are often toxic to the cells

antibiotic yields are generally higher when cells enter the stationary phase

All of these

Both (a) and (b)

Mycelial mass increases

Synthesis of penicillin is high

pH increase