When prokaryotes live as interacting communities in which one population benefits to the harm of the other, the type of symbiosis is called ________.

The domain ________ does not include prokaryotes.

Pathogenic bacteria that are part of the transient microbiota can sometimes be eliminated by ________ therapy.

Nitrogen-fixing bacteria provide other organisms with usable nitrogen in the form of ________.

Rickettsias are ________ intracellular bacteria.

The species ________, which belongs to Epsilonproteobacteria, causes peptic ulcers of the stomach and duodenum.

The genus Salmonella belongs to the class ________ and includes pathogens that cause salmonellosis and typhoid fever.

The bacterium that causes syphilis is called ________.

Bacteria in the genus Rhodospirillum that use hydrogen for oxidation and fix nitrogen are ________ bacteria.

Streptococcus is the ________ of bacteria that is responsible for many human diseases.

One species of Streptococcus, S. pyogenes, is a classified as a ________ pathogen due to the characteristic production of pus in infections it causes.

Cutibacterium belongs to ________ G+C gram-positive bacteria. One of its species is used in the food industry and another causes acne.

The length of the branches of the evolutionary tree characterizes the evolutionary ________ between organisms.

The deeply branching bacteria are thought to be the form of life closest to the last universal ________ ________.

Many of the deeply branching bacteria are aquatic and hyperthermophilic, found near underwater volcanoes and thermal ocean ________.

The deeply branching bacterium Deinococcus radiodurans is able to survive exposure to high doses of ________.

________ is a genus of Archaea. Its optimal environmental temperature ranges from 70 °C to 80 °C, and its optimal pH is 2–3. It oxidizes sulfur and produces sulfuric acid.

________ was once thought to be the cause of periodontal disease, but, more recently, the causal relationship between this archaean and the disease was not confirmed.