What are the reasons for being able to identify an unknown bacterium?
Your question is a little unclear, as by definition one cannot identify something that is unknown. If you mean that one might want to identify a bacterium that is found somewhere, that’s one thing. If you mean that one might want to classify a newly discovered bacteria, here are some reasons… The bacterium might be pathogenic. The bacterium might be drug-resistant. The bacterium might be the product of a man-induced mutation. The bacterium might have beneficial properties.