MCQ
Vitamin $B_{12}$ is produced directly during the course of fermentation by
- AAshbya gossypii
- BRhizopus stolonifer
- CSaccharomyces cerevisiae
- ✓Propioni bacteria
(d)It has been demonstrated that Propionibacteria species has the highest potential to accumulate vitamin $B _{12}$ intracellularly. Propionibacterium shermanii and Propionibacterium freudenreichiiare most widely used. Propionibacteriaproduce vitamin $B _{12}$ intracellularly and excrete mainly propionic acid and acetic acid extracellularly.
All Propionibacterium strains employed for vitamin $B _{12}$ production are microaerophilic and produce vitamin $B _{12}$ in high yields only under very low oxygen concentrations.
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