Biofilm Formation in Bacterial Organisms
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Questions and Answers

Bacterial organisms form a biofilm to

  • mate with other bacterial organisms of the same or different species
  • find a food source when nutrients are scarce
  • attach to a surface in an area where food is plentiful (correct)
  • claim territory and fight off competing organisms of a different species
  • When a microorganism is found in an environment below its minimum growth temperature,

  • growth stops because the cell membrane melts
  • the cell dies
  • growth slows but does not stop
  • growth slows or stops because enzymatic processes become sluggish (correct)
  • Which of the following statements regarding examples of chemotrophy is FALSE?

  • NAD plays an important role in chemotrophic metabolism
  • Glucose is reduced compound that freely donates electrons to NAD, a more oxidized compound
  • Glucose is an important chemotrophic carbon source
  • Glucose is an oxidized compound that freely donates electrons to NAD, a more reduced compound (correct)
  • Which of the following is NOT used for attachment in biofilm formation?

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

    A facultative organism might prefer aerobic respiration over fermentation when carbohydrates become scarce because it gets

    <p>more energy from aerobic respiration</p> Signup and view all the answers

    What type of disease transmission would be associated with pathogens that can form endospores?

    <p>Both direct and indirect</p> Signup and view all the answers

    Which of the following is NOT required for microorganisms to grow and divide?

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

    Which of the following is NOT necessary for endospore formation?

    <p>Exopolysaccharide formation</p> Signup and view all the answers

    Which of the following is true about MacConkey medium?

    <p>The plate is both selective and differential</p> Signup and view all the answers

    In the figure below, in which phase(s) do(es) the number of bacteria change exponentially?

    <p>2 and 4</p> Signup and view all the answers

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