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Which of the following gene clusters in bacteria is responsible for nitrogen fixtion?

a)

Nod, nif, fix

b)

Nod, ndf, nfx

c)

Nod, nix, nfx

d)

Ndx,  nif,  fix



Question ID - 4311 | SaraNextGen Top Answer

Which of the following gene clusters in bacteria is responsible for nitrogen fixtion?

a)

Nod, nif, fix

b)

Nod, ndf, nfx

c)

Nod, nix, nfx

d)

Ndx,  nif,  fix

1 Answer
127 votes
Answer Key / Explanation : (a) -

(a)

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, which given then host specificity.

In symplasmid of Rhizobium leguminosarum var. viciae, nod genes for nitrogen fixation, the nif genes.

Number of nod  genes are present in different species leading to nod factors, which induce root hair curling cell division, nodule formation.

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