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?

    <p>Deinococcus</p> Signup and view all the answers

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

    <p>Aquifex</p> Signup and view all the answers

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

    <p>Anoxygenic phototrophy</p> Signup and view all the answers

    Which of the following is a characteristic of Proteobacteria?

    <p>They include phototrophic and chemolithotrophic species</p> Signup and view all the answers

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

    <p>Alpha-proteobacteria</p> Signup and view all the answers

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

    <p>Bacillus</p> Signup and view all the answers

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

    <p>They have a particular cell wall structure that stains 'Gram-positive'</p> Signup and view all the answers

    Which of the following is a characteristic of Cyanobacteria?

    <p>They are oxygenic phototrophs</p> Signup and view all the answers

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

    <p>They produced oxygen as a waste product</p> Signup and view all the answers

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