all of the following statements concerning the actinomycetous filamentous soil bacterium Frankia are correct except that Frankia

Options

A. can induce root nodules on many plant species
B. can fix nitrogen in the free-living state
C. like Rhizobium, it usually infects its host plant through root hair deformation and stimulates cell proliferation on the hosts' cortex.
D. forms specialised vesicles, in which the nitrogenase is protected from oxygen by a chemical barrier involving triterpene hopanoids.

Answer

B