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

---

6. At acidic pH, penicillin remains in
A.aqueous phase
B.solvent phase
C.both (a) and (b)
D.precipitates

---

7. Chlorotetracyclin is soluble in
A.organic solvents
B.water
C.ether
D.all of these

---