BotanyHow many ATP molecules are required to form a molecule of ammonia from a molecule of nitrogen ?

How many ATP molecules are required to form a molecule of ammonia from a molecule of nitrogen ?

  1. A

    8

  2. B

    4

  3. C

    2

  4. D

    16

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    Solution:

    Some of the plants, especially the roots of legumes live in symbiotic association with N2​-fixing bacteria. They can fix nitrogen into biologically usable forms. This phenomenon is called symbiotic nitrogen fixation. The enzyme nitrogenase is required to fix atmospheric nitrogen. The molecule of nitrogen is reduced by the addition of hydrogen atoms provided by a reducing agent like NADPH2​. It produces dimide (N2​H2​), hydrazine (N2​H4​) and finally ammonia (NH3​) is formed.

    The overall reaction involved in N2​-fixation is

    N2​+8e−+8H++16ATP→2NH3​+H2​+16ADP+16Pi​
     

    Thus, one mole of nitrogen is converted into two molecules of ammonia. For producing 1 molecule of ammonia, 8 ATPs are needed. 


     

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