Question

How could inorganic nitrogen become organic nitrogen in corn? Corn has no root nodules. Choose the one best answer.

1.N2 gas is fixed by Rhizobia associated with corn roots, the nitrogen is fixed into ammonia, which becomes ammonium, and the ammonium is then assimilated into the roots of the corn. The nitrogen is used to produce ATP.

2.Corn roots take up N2 gas, assimilate the gas, and use the nitrogen to make amino acids and, eventually, proteins

3.Corn roots take up ammonium from the soil, assimilate the ammonium, and the nitrogen is used to make nucleotides and, eventually, DNA.

Answer 1

Answer:

Which bacteria is responsible for nitrogen fixation?

Nitrogen fixation occurs when these plants are in the symbiotic state and the agents of fixation are soil bacteria from the genera Rhizobium, Bradyrhizobium, Sinorhizobium, Mesorhizobium, Azorhizobium and Allorhizobium (the traditional rhizobia from the alpha-Proteobacteria) as well as some more recently discovered ...