Which of the following bacteria requires nicotinic acid as a growth factor in their media?

Which of the following bacteria requires nicotinic acid as a growth factor in their media?

Q. Which of the following bacteria requires nicotinic acid as a growth factor in their media?

  1. Nitrosomonas sp
  2. coli
  3. Proteus vulgaris
  4. none of the above

Answer: Proteus vulgaris

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