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All of the following statements concerning the Actinomycetes filamentous soil bacterium Frankia are correct except that Frankia:

1. (a) Can induce root nodules on many plant species
2. (b) Cannot fix nitrogen in the free-living state.
3. (c) Forms specialized vesicles in which the nitrogenase is protected from oxygen by a chemical barrier involving triterpene hopanoids
4. (d) Like Rhizobium, it usually infects its host plant through root hair deformation and stimulates cell proliferation in the host’s cortex

Correct answer: (b) Cannot fix nitrogen in the free-living state.

Solution

The incorrect statement is the one claiming Frankia cannot fix nitrogen freely. Frankia is capable of nitrogen fixation in the free-living state, so that option is false; the other statements describe its symbiosis and oxygen-protective vesicles correctly.

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