You have isolated an aerobic gram- positive, endospore- forming bacterium that grows well on nutrient agar. To which of the following groups does it most likely belong?
A) bacillales
B) deltaproteobacteria
C) phototrophic bacteria
D) gammaproteobacteria
E) The answer cannot be determined based on the information provided.

Question

Quizplus · Accepted Answer

The fact that the bacterium is aerobic and gram-positive immediately eliminates the possibility of it belonging to the deltaproteobacteria and phototrophic bacteria groups. The fact that it forms endospores further narrows it down to either the bacillales or clostridia orders within the Firmicutes phylum. However, clostridia are anaerobic while the bacterium in question is aerobic, therefore it can be concluded that it most likely belongs to the bacillales order within the Firmicutes phylum.

You Have Isolated an Aerobic Gram- Positive, Endospore- Forming Bacterium