ANTIBIOTICS QUIZ

Steptomyces aureofaciens

Nocardia sulphurea

Steptomyces ramosus

All of these

the precursors are often toxic to the cells

All of these

antibiotic yields are generally higher when cell growth slows

antibiotic yields are generally higher when cells enter the stationary phase

All of these

Concentration of antibiotic increases in the medium

Slight rise in pH due to liberation of ammonia

Autolysis of the medium starts

rice seeds

barley seeds

wheat seeds

all of these

source of nutrients

carbon source

both (a) and (c)

antifoam agent

precipitates

aqueous phase

solvent phase

both (a) and (b)

sodium penicillin

calcium penicillin

penicillin only

potassium penicillin

both (a) and (b)

precipitates

solvent phase

aqueous phase

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

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

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

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

aeration which does not affect the yield

continuous aeration

no aeration

controlled aeration