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41. The precursor used for the production of vitamin B₁₂ by Streptomyces olivaceus is

A. cobalt chloride
B. cobalt sulfate
C. calcium chloride
D. calcium sulfate

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42. Most biopolymers produced by micro-organisms are

A. cell wall constituents
B. nucleic acids
C. histones
D. exopolysaccharides

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43. Microbial rennet, which is used in cheese manufacture is produced by

A. Mucor spp
B. Aspergillus spp
C. Bacillus spp
D. Saccharomyces spp

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44. Production of L-lysine can be carried out by

A. C. glutamicum
B. B. flavum FA 1-30
C. B. flavum
D. All of these

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45. The citric acid is recovered from the fermentation broth as

A. calcium citrate
B. magnesium citrate
C. zinc citrate
D. none of these

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