The bacterium that cannot tolerate oxygen is Anaerobes, but there are different kinds and each has different tolerances when it comes to oxygen. Obligate Anaerobes can get killed by oxygen. Facultative anaerobes those can grow without oxygen. Aero-tolerant anaerobes they never use oxygen BUT they can tolerate it. Microaerophiles require i tiny bit of oxygen but anymore than the little bit they need and they cannot grow.
Viruses use enzymes to destroy host cells after replication is complete.
vectoring is the right answer
antibiotics
They all cause disease.
Anaerobes is associated with methanogens.
megaminx
Genus and species.
Antibiotics are always beneficial