Multiple choice

Which of the following microorganisms yields the greatest amount of vitamin B12?

  1. Rhodopseudomonas protamicus

  2. Rhodopseudomonas spheroides

  3. Pseudomonas denitrificans

  4. Propionibacterium freudenreichii
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A Correct answer
Explanation

Rhodopseudomonas protamicus is a hybrid strain of Rhodopseudomonas spheroides and Protaminobacter rubber and can produce as high as 135 mg/l of vitamin B12 utilising carbon source. Thus, it is the strain that yields the greatest amount of vitamin B12.

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