Bacterial Phage Life Cycles Quiz
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Questions and Answers

What is the term used for plasmids that confer pathogenicity?

  • Killer plasmids
  • Virulence plasmids (correct)
  • F plasmids
  • R plasmids

    • What is the function of Hfr cells in bacterial conjugation?

  • To kill other bacteria
  • To metabolize unusual molecules
  • To integrate F plasmid into the bacterial chromosome (correct)
  • To transfer resistance to antibiotics

    • Which type of plasmid synthesizes toxins that kill other bacteria?

  • R plasmids
  • Killer plasmids (correct)
  • Virulence plasmids
  • F plasmids

    • What distinguishes Hfr cells from other bacterial cells during conjugation?

    <p>Ability to form pilus</p> Signup and view all the answers

    Which plasmid type allows bacteria to utilize persistent organic compounds like toxins and synthetic compounds?

    <p>Degradative plasmids</p> Signup and view all the answers

    In bacterial conjugation, what is the main function of F plasmids?

    <p>To promote conjugation by forming pilus</p> Signup and view all the answers

    What is the key characteristic of lysogenic bacteriophages?

    <p>They can integrate their DNA into the bacterial chromosome.</p> Signup and view all the answers

    During the lytic cycle, what is the first step that occurs after the phage adsorbs to the bacterial surface?

    <p>Passage of phage DNA through the bacterial cell wall</p> Signup and view all the answers

    What is a common property of lysogens that makes them immune to reinfection by a phage?

    <p>They possess prophages integrated into the bacterial chromosome.</p> Signup and view all the answers

    What is the main genetic element defined as the genome of the bacterium Escherichia coli str.K-12 substr.MG1655?

    <p>Chromosomal DNA</p> Signup and view all the answers

    What type of bacteria lacks certain organelles such as mitochondria and chloroplasts?

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

    In the lysogenic cycle, what happens to a bacterium containing a complete set of phage genes?

    <p>It becomes a lysogen.</p> Signup and view all the answers

    Which bacterium causes food poisoning and is extensively studied in relation to bacteriophages?

    <p>Salmonella typhimurium</p> Signup and view all the answers

    What distinguishes temperate phages from virulent phages?

    <p>Temperate phages can undergo lysogenic cycle.</p> Signup and view all the answers

    What happens during induction in lysogens?

    <p>The prophage is excised from the bacterial chromosome and triggers the lytic cycle.</p> Signup and view all the answers

    What are the genetic elements found in bacteria based on the provided text?

    <p>Chromosomal DNA, plasmids, transposable elements</p> Signup and view all the answers

    Which of the following bacterial characteristics is associated with a lack of nuclear membrane and certain organelles?

    <p>Rod shape</p> Signup and view all the answers

    What is the size of the genome of Escherichia coli K-12 substr.MG1655 in bases according to the text?

    <p>$4,639,221$ bases</p> Signup and view all the answers

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