 
			 
			MCQOPTIONS
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				| 1. | Which of the following bacteria requires nicotinic acid as a growth factor in their media? | 
| A. | Proteus vulgaris | 
| B. | Nitrosomonas sp. | 
| C. | E. coli | 
| D. | Leuconostoc mesenteroides | 
| Answer» B. Nitrosomonas sp. | |