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MCAT Question A Day - 7/21/13

Certain bacteria in the soil and in the root nodules of plants called legumes are unique in that they can convert nitrogen gas in the air into ammonia. Without nitrogen fixation, the first step in the nitrogen cycle, other living organisms would be unable to synthesize

A.  proteins.
B.  nucleic acids.
C.  ATP.
D.  All of the above

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