The imidazole ring of histidine contains two atoms of this element, two isotopes of which were used in the Meselson-Stahl experiment. Pseudomonas and Paracoccus species can convert compounds containing this element to its elemental gaseous form. Purines contain five atoms of this element, which mammals excrete in the compound urea. The symbiosis of Rhizobium and legume roo
The imidazole ring of histidine contains two atoms of this element, two isotopes of which were used in the Meselson-Stahl experiment. Pseudomonas and Paracoccus species can convert compounds containing this element to its elemental gaseous form. Purines contain five atoms of this element, which mammals excrete in the compound urea. The symbiosis of Rhizobium and legume roots fixes this element in its namesake cycle. For 10 points, name this element found in namesake nucleic acid bases and bound to three hydrogen atoms in ammonia.
The imidazole ring of histidine contains two atoms of this element, two isotopes of which were used in the Meselson-Stahl experiment.
nitrogen [or N]