During the initiation of nitrogen-fixation nodules, the Rhizobium bacteria release what type of molecules to signal the host plant?  

A.  sugars
B.  proteins
C.  transcription factors
D.  flavonoids
E.  Nod factors


E.  Nod factors

Once the bacteria receive chemical signals called flavonoids from the plant root hair, they release chemical signals called Nod factors. This signals the root hair to grow and curl around the bacteria and the nodule begins to form.

Biology & Microbiology

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