Antibiotics – Section 1

1. The yield of the antibiotic depends upon

A. pH of the medium
B. age of the inoculum
C. composition of the medium
D. all of these

Correct Answer: D. all of these

2. During which phase of growth of Penicillium chrysogenum maximum antibiotic production takes place

A. during the first phase
B. during the second phase
C. during the third phase
D. same in all the phases

Correct Answer: B. during the second phase

3. Fermentation medium for oxytetracyclin (terramycin) consist of

A. CSL, starch, (NH4)2SO4, sodium chloride and CaCO3
B. CSL, (NH4)2SO4, sodium chloride and CaCO3
C. CSL, starch,(NH4)2SO4, ammonium chloride and CaCO3
D. CSL,(NH4)2SO4, ammonium chloride and CaCO3

Correct Answer: A. CSL, starch, (NH4)2SO4, sodium chloride and CaCO3

4. pH of the fermentation medium for chlorotetracyclins is

A. 5-6
B. 6-7
C. 7-8
D. 8-9

Correct Answer: A. 5-6

5. At normal pH, penicillin remains in

A. aqueous phase
B. solvent phase
C. both (a) and (b)
D. precipitates

Correct Answer: A. aqueous phase

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