Nitrogen is converted into ammonia by microorganisms in the process of nitrogen fixation. This ammonia is then used to make amino acids and nucleotides, which are building blocks of proteins and DNA. Thus, option B is the best choice.

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Nitrogen Is

Question 31

Multiple Choice

Nitrogen is

A) an important constituent of carbohydrates AND primarily fixed by fungi.
B) turned into ammonia by microorganisms AND ultimately used in making amino acids and nucleotides.
C) primarily fixed by fungi AND ultimately used in making amino acids and nucleotides.
D) ultimately used in making amino acids and nucleotides AND an important constituent of carbohydrates.
E) turned into ammonia by microorganisms AND ultimately used in making bacterial capsules.

Correct Answer: