46. The species of Acetobacter which produces cellulosic strands to hold the cells in lime layer is

A. Acetobacter curvum
B. Accetobacter orleanense
C. Acetobacter xylinum
D. Acetobacter schuetzenbachii

47. The commonly used media for submerged bacterial fermentation at commercial scale is

A. beet molasses
B. liver extract
C. germinated seed
D. none of these

48. Which of the following microorganism produces only L(+) – lactic acid without further racemization?

A. Leuconostoc mesenteroides
B. Lactobacillus delbrueckii
C. Rhizopus oryzae
D. Lactobacillus bulgaricus

49. The recovery of the vitamin from fermentation broth is carried out prior to

A. acidification
B. alcohol treatment
C. autolysis
D. none of these

50. Naringinase, an enzyme commonly used for removal of the bitter taste from citrus juice is obtained from

A. A. niger
B. A.flavus
C. A. oryzae
D. S. cerevisiae