You Have Isolated a Bacterium That Grows in a Medium

Multiple Choice

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. You can be sure that this bacterium is

A) a chemoautotroph.
B) a photoheterotroph.
C) a photoautotroph.
D) gram-positive.
E) using anaerobic respiration.