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(C) $Frankia$ is a filamentous soil bacterium that forms symbiotic nitrogen-fixing root nodules in actinorhizal plants. $1$. $Frankia$ is capable of i

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Cannot fix specialized vesicles in which the nitrogenase is protected from oxygen by a chemical barrier involving triterpene hopanoids

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(C) $Frankia$ is a filamentous soil bacterium that forms symbiotic nitrogen-fixing root nodules in actinorhizal plants. $1$. $Frankia$ is capable of inducing root nodules on many plant species (actinorhizal plants). $2$. It is known that $Frankia$ can fix nitrogen in the free-living state,although the rate is often lower than in symbiosis. $3$. The statement in option $C$ is incorrect because $Frankia$ $DOES$ form specialized structures called vesicles. These vesicles provide an anaerobic environment for the enzyme nitrogenase,protecting it from oxygen using a chemical barrier composed of triterpene hopanoids. $4$. Like $Rhizobium$,$Frankia$ infects host plants via root hair deformation and triggers cortical cell division to form nodules. Therefore,the incorrect statement is $C$.

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

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