Microbiology Quiz: Domains of Life
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Questions and Answers

What is a common method used to determine the relatedness of organisms based on their genetic material?

  • Proteobacteria
  • LUCA
  • Arg operons
  • Sigma factors
  • Phylogeny (correct)
  • Which type of bacteria is known for its ability to form endospores as a survival mechanism?

  • Firmicutes (correct)
  • Proteobacteria
  • Gamma proteobacteria
  • Actinobacteria
  • Tenericutes
  • Which factor plays a crucial role in regulating gene expression in bacteria by binding to RNA polymerase?

  • LUCA
  • Species richness
  • Marker genes
  • Sigma factors (correct)
  • Arg operons
  • What is the term for the total number of viable bacterial cells per unit volume in a sample?

    <p>Cfu per ml</p> Signup and view all the answers

    Which bacterial group is responsible for nitrogen fixation, aiding in converting atmospheric nitrogen into a usable form?

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

    Which process involves aligning sequences of DNA, RNA, or protein to identify similarities between them?

    <p>Sequence alignment</p> Signup and view all the answers

    Which microbial group is characterized by having a cell wall structure that includes an outer membrane?

    <p>Gram-negative bacteria</p> Signup and view all the answers

    Which term refers to the specific study of how genes function within prokaryotic cells?

    <p>Gene expression</p> Signup and view all the answers

    In microbial ecology, what does species richness refer to?

    <p>Number of different bacterial species present in a community</p> Signup and view all the answers

    What is the term for the common ancestor of all life on Earth?

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

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