A) Nod, nif, fix
B) Nod, ndf, nfx
C) Nod, nix, nfx
D) Ndx, nif, fix
E) Ndx, nif, nix
Correct Answer: A
Solution :
Genes that direct the steps in nodulation of a legume by a specific rhizobial strain are called nod genes. Many nod genes from different rhizobia are highly conserved and are contained on large plasmids called sym (for symbiosis) plasmids, which give them host specificity. In sym plasmid of Rhizobium leguminosarum var. viciae, nod genes are located between two clusters of genes for nitrogen fixation, the nif genes. Number of nod genes are present in different specials leading to nod factors, which induce root hair curling, cell division, nodule formation.
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