Characteristics of Gram-Negative Rods Quiz
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Questions and Answers

Which of the following statements is true about Klebsiella?

  • Klebsiella is a motile bacterium with peritrichous flagella.
  • Klebsiella is a facultative anaerobe that is oxidase-positive.
  • Klebsiella forms mucoid colonies due to being capsulated. (correct)
  • Klebsiella reduces nitrate and ferments glucose.
  • What distinguishes Shigella and Klebsiella from other members of Enterobacteriaceae?

  • Shigella and Klebsiella do not ferment glucose.
  • Shigella and Klebsiella are motile bacteria.
  • Shigella and Klebsiella are oxidase-positive bacteria.
  • Shigella and Klebsiella are nonmotile bacteria. (correct)
  • Which of the following is a common feature of Enterobacteriaceae?

  • They are nonmotile bacteria.
  • They ferment lactose. (correct)
  • They are gram-positive bacilli.
  • They are oxidase-positive facultative anaerobes.
  • What is the most famous medium used for growing Enterobacteriaceae?

    <p>MacConkey's agar</p> Signup and view all the answers

    Why are many lab media selective for Enterobacteriaceae?

    <p>To suppress the growth of nonpathogenic species and G+ organisms</p> Signup and view all the answers

    Which of the following genera are opportunistic pathogens?

    <p>Klebsiella, Enterobacter, Yersinia</p> Signup and view all the answers

    Study Notes

    Klebsiella

    • Klebsiella is a genus of bacteria in the family Enterobacteriaceae.
    • Klebsiella are facultative anaerobic, Gram-negative, rod-shaped bacteria.

    Shigella and Klebsiella

    • Shigella and Klebsiella are distinguished from other members of Enterobacteriaceae by their inability to ferment lactose.

    Enterobacteriaceae

    • Enterobacteriaceae are commonly found in the intestinal tract of humans and animals.
    • They are facultative anaerobes, rod-shaped, and Gram-negative.
    • Enterobacteriaceae are known for their ability to ferment carbohydrates, a feature that is often used to distinguish between different species.

    Media for Growing Enterobacteriaceae

    • MacConkey agar is a commonly used medium for growing Enterobacteriaceae.
    • MacConkey Agar contains bile salts, crystal violet dye, and lactose
    • These components are selective for Enterobacteriaceae, which are able to grow even in the presence of these inhibitory substances, while other bacteria are inhibited.

    Opportunistic Pathogens

    • Several genera of Enterobacteriaceae are opportunistic pathogens, meaning they can cause disease in individuals who are immunocompromised or have underlying health conditions.
    • Examples of opportunistic pathogens include Klebsiella, Escherichia, and Proteus.

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    Description

    Test your knowledge on the characteristics of small gram-negative rods, including their size, motility, oxidase reaction, nitrate reduction, carbohydrate fermentation, and examples of common genera. Learn about the differences between motile and nonmotile strains and their pathogenicity.

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