Remember that the structure of amino acids have an amino group (NH₃--Cα)
Explanation:
Plants will absorb the radioactive nitrogen compounds as ammonium (NH4+) nitrates (NO3-)and nitrites (NO2-). The radioactive Nitrogen will found in amino acids because the absorbed nitrates, nitrites and ammonium undergo a process called assimilation. The nitrates and nitrites are firstly reduced to ammonia. The ammonia is then assimilation is a pathway called glutamine synthetase-glutamate synthase (GS-GOGAT). IN this pathway the ammonia is incorporated into the amino group of glutamine using glutamine synthase enzyme. The process of transamination of the glutamine then creates many other amino acids.
Learn More:
For more on assimilation of nitrates in plants check out these;
