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Microbiology Quiz: Domain Bacteria Proteobacteria

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Microbiology Quiz: Domain Bacteria Proteobacteria

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Questions and Answers

What is unique about Spirochetes among all prokaryotes?

Their helical morphology (correct)

Their ability to form heterocysts

Their ability to fix nitrogen

Their aquatic lifestyle

Which genus is described as having a very unusual morphology of aquatic cells that attach by a stalk?

Deinococcus

Spirochetes

Thermus (correct)

Chlamydia

What is the primary distinguishing feature of Chloroflexus compared to cyanobacteria in terms of photosynthesis pathways?

Thermophilic nature

Formation of heterocysts

Older pathway for photosynthesis (correct)

More advanced DNA repair machinery

Which bacteria are known for their innate resistance to high levels of radiation?

Deinococcus (C) Signup and view all the answers

Which bacteria are hyperthermophiles known for growing near the boiling point of water?

Aquifex (C) Signup and view all the answers

What is the primary characteristic of Green nonsulfur bacteria that sets them apart from other bacterial groups mentioned?

Anoxygenic phototrophy (A) Signup and view all the answers

Which of the following is a characteristic of Proteobacteria?

They include phototrophic and chemolithotrophic species (B) Signup and view all the answers

According to the endosymbiont hypothesis, which group of bacteria are mitochondria believed to be descendants of?

Alpha-proteobacteria (D) Signup and view all the answers

Which of the following genera is an example of Gram-positive bacteria?

Bacillus (D) Signup and view all the answers

Which of the following statements about Gram-positive bacteria is true?

They have a particular cell wall structure that stains 'Gram-positive' (A) Signup and view all the answers

Which of the following is a characteristic of Cyanobacteria?

They are oxygenic phototrophs (B) Signup and view all the answers

Why are Cyanobacteria believed to have been critical to the evolution of life?

They produced oxygen as a waste product (A) Signup and view all the answers