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Microbiology

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MicrobiologyFill in the Blank

Fill in the Blank

17.

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

18.

The domain ________ does not include prokaryotes.

19.

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

20.

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

21.

Rickettsias are ________ intracellular bacteria.

22.

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

23.

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

24.

The bacterium that causes syphilis is called ________.

25.

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

26.

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

27.

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

28.

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

29.

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

30.

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

31.

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

32.

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

33.

________ 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.

34.

________ 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.

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