Gram-negative nitrogen-fixing bacteria found in association with plant roots are

A) alphaproteobacteria.
B) betaproteobacteria.
C) cyanobacteria.
D) gammaproteobacteria.
E) deeply branching bacteria.


A
Bloom's Taxonomy: Knowledge
Section: Survey of Bacteria
Learning Outcome: 11.19, 11.25

Biology & Microbiology

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