ANTIBIOTICS QUIZ

precipitates

solvent phase

both (a) and (b)

aqueous phase

pH increase

Synthesis of penicillin is high

Both (a) and (b)

Mycelial mass increases

calcium penicillin

sodium penicillin

penicillin only

potassium penicillin

6-7

5-6

8-9

7-8

All of these

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

Ammonia is liberated in the medium

Growth of mycelia occurs

all of these

wheat seeds

barley seeds

rice seeds

continuous aeration

aeration which does not affect the yield

no aeration

controlled aeration

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

during the second phase

same in all the phases

during the third phase

during the first phase

Steptomyces aureofaciens

Nocardia sulphurea

Steptomyces ramosus

All of these