Nitrogen fixation is
A) rare among microorganisms.
B) widespread among microorganisms.
C) limited to Proteobacteria.
D) common in Bacteria, but absent in Archaea.
Correct Answer:
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Q15: You are looking at a sample from
Q16: Purple sulfur bacteria are
A) alphaproteobacteria that oxidize
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
Q21: Most methanotrophs are obligate _ because _.
A)
Q22: Nitrogenase is a critical enzyme in the
Q23: Which of the following functional groups form
Q24: Bdellovibrio species are _ cells that replicate
Q25: Green sulfur bacteria are often found at
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