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

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

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

4. pH of the fermentation medium for chlorotetracyclins is

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

5. At normal pH, penicillin remains in

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