Purple sulfur bacteria are
A) alphaproteobacteria that oxidize hydrogen sulfide in the presence of oxygen or nitrate.
B) gammaproteobacteria that use hydrogen sulfide as an electron donor for photosynthesis.
C) a phylogenetically heterogeneous group of microbes that reduce sulfate to sulfur.
D) thermophilic bacteria that reduce elemental sulfur to sulfide.
Correct Answer:
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Q11: Sulfate-reducing bacteria are a _ that are
Q12: The Cyanobacteria are united by their _,
Q13: Aside from using light as a source
Q14: Functional traits can be shared between organisms
Q15: You are looking at a sample from
Q17: Which group of bacteria would you expect
Q18: Aerobic anoxygenic phototrophs
A) do not use bacteriochlorophyll.
B)
Q19: You are looking at a sample from
Q20: Nitrogen fixation is
A) rare among microorganisms.
B) widespread
Q21: Most methanotrophs are obligate _ because _.
A)
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