You have isolated a bacterium that grows in a medium containing an organic substrate and nitrate in the absence of oxygen. The nitrate is reduced to nitrogen gas. This bacterium is

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Quizplus · Accepted Answer

The bacterium is using anaerobic respiration, as indicated by its growth in the absence of oxygen and the reduction of nitrate to nitrogen gas. This process does not require light (ruling out photoautotroph and photoheterotroph) and involves the use of an organic substrate, indicating it is not a chemoautotroph (which would use inorganic substances). The information provided does not specify the Gram staining characteristics, so D cannot be determined.

You Have Isolated a Bacterium That Grows in a Medium