26. Which of the following species is used for vitamin B12 production by fermentation process?
A. Streptomyces griseus
B. Streptomyces olivaceus
C. Bacillus megaterium
D. All of these
27. The malt used to ferment beer is prepared by
A. roasting barley
B. washing the barley with water and drying it in air
C. soaking barley in water followed by germination and drying
D. treating barley with bovine amylase followed by roasting
28. Penicillin was first produced commercially using
A. stationary mat culture
B. deep tank aerated fermentations
C. continuous fermentation
D. none of the above
29. The present-day high yielding penicillin are obtained from
A. Penicillium chrysogenum (NRRL, 1951)
B. Penicillium chrysogenum (Q-176)
C. Penicillium chrysogenum (Q-179)
D. none of the above
30. The medium utilized for fungal citric acid production should be deficient in
A. phosphate
B. manganese
C. iron
D. all of these