Obligate aerobes
Bacteria that must have oxygen to survive are called obligate aerobes. Some bacteria can live with or without oxygen and are called facultative anaerobes.Anaerobes = No oxygenAerobes = Oxygen
Archaebacteria called extremeophiles have some species that live entirely anaerobically. Bacteria [and other organisms] that respire using O2 as the 'final' electron acceptor are termed to be Aerobic, while bacteria [and the odd organism] that has the biochemical capacity to Live without O2 are termed to be Anaerobic.
Obligate aerobes.
Bacteria do not breathe in the sense that we do, but many do require oxygen. These are called aerobic bacteria. Some bacteria will use oxygen if it is present, but can function without it. These are called facultative anaerobes. Still other bacteria will die if exposed to oxygen. These are called obligate anaerobes.
anaerobic bacteria
Some bacteria and protists called anaerobes can live without oxygen. Three kingdoms have organisms that have anaerobes- kingdom bacteria, kingdom archaea, and kingdom protista
If they CAN survive without oxygen, they are called facultative anaerobes. In other words, these can survive with or without oxygen.If they CAN ONLY survive if there is no oxygen, they are callled obligate anaerobes. In other words, these can only survive if there is no oxygen.
Anaerobic bacteria can live without oxygen. In fact, oxygen is toxic to many of them.
Bacteria lacking a nucleus
An anaerobic infection is an infection caused by bacteria (called anaerobes) which cannot grow in the presence of oxygen.
You are a bit confused. Alcohol is generally toxic to bacteria, whether aerobic or anaerobic, but anaerobic bacteria cannot live in the presence of oxygen, that's why they are called anaerobic.
Facultative anaerobic bacteria.