Based on oxygen requirements and metabolic strategies, isolating an epsilonproteobacterium from ________ would likely be MOST fruitful.
A) anoxic and sulfate-rich waters
B) a plant's rhizosphere
C) sulfate-rich anoxic-oxic interfaces
D) sulfide-rich soils
A bacterium with which metabolism is MOST likely to form a relationship with Syntrophobacter wolinii?
A) acetate oxidation
B) ammonia oxidation
C) molecular hydrogen oxidation
D) propionate catabolism
Which relationship is MOST likely to be observed between species of different classes?
A) A deltaproteobacterium oxidizes hydrogen sulfide into sulfate, which is then reduced by an epsilonproteobacterium.
B) An epsilonbacterium oxidizes the hydrogen sulfide produced by a sulfur-reducing deltaproteobacterium.
C) A sulfate-reducing epsilonbacterium produces sulfite, which a deltaproteobacterium reduces to hydrogen sulfide.
D) Syntrophic metabolism of sulfur by a deltaproteobacterium and an epsilonproteobacterium occurs.
Which of the following is NOT a trait of rickettsias?
A) They are obligate intracellular parasites.
B) They lack cell walls.
C) They have not been cultivated in the absence of host cells.
D) Both the host and parasite are required in order to be alive and metabolically active.
A pseudomonad that loses its R plasmid in the soil is LEAST likely to
A) cause an infection in a human.
B) colonize a surface.
C) infect a shrub.
D) survive a habitat dominated by antibiotic-producing Streptomyces spp.
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