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(Solved): Make a dichotomous key to distinguish the alphaproteobacteria described in this chapter (Pelagibact ...
Make a dichotomous key to distinguish the alphaproteobacteria described in this chapter (Pelagibacter, Rickettsia, Ehrlichia, Brucella, Bartonella, Wolbachia, Nitrobacter \& Nitrosomonas, Agrobacterium, Rhizobium \& Bradyrhizobium, Azospirllium, Acidithiobacillus, Caulobacter \& Hyphomicrobium, and Acetobacter \& Gluconobacter).
Expert Answer
Cells are obligate intracellular parasites, lacking a peptidoglycan cell wall; transmitted by arthropod vectors. ? RickettsiaCells are not obligate intracellular parasites; may have a peptidoglycan cell wall. ? 2Cells are small and abundant in marine environments; contain bacteriochlorophyll a. ? PelagibacterCells are not marine; lack bacteriochlorophyll a. ? 3Cells are obligate aerobes; that can fix atmospheric nitrogen in association with plants. ? AzospirillumCells are not obligate aerobes and do not fix atmospheric nitrogen; can grow under acidic conditions. ? AcidithiobacillusCells are not obligate aerobes; are capable of nitrogen fixation in symbiosis with legumes. ? 4