MLBT1080 Enterobacteriaceae MCQs
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MLBT1080 Enterobacteriaceae MCQs

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Questions and Answers

Which of the following is true about Enterobacteriaceae?

  • They are Gram-positive bacilli
  • They are Gram-negative bacilli (correct)
  • They form spores
  • They do not form spores
  • What is the common term used to refer to the Family Enterobacteriaceae?

  • Cocci
  • Coliforms
  • Enterics (correct)
  • Bacilli
  • Which of the following is NOT one of the four major features shared by Enterobacteriaceae?

  • Oxidase-negative
  • Reduce nitrates to nitrites
  • Motile (correct)
  • Ferment glucose
  • Which of the following Enterobacteriaceae is NOT included in the list of non-motile organisms?

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

    What is the biochemical test used to distinguish Enterobacteriaceae from other Gram-negative bacteria?

    <p>Nitrate reduction test</p> Signup and view all the answers

    What is the value of colony morphology on BAP or CA in distinguishing Enterobacteriaceae?

    <p>It has little value in distinguishing them, except for Klebsiella</p> Signup and view all the answers

    Which of the following media are used for the initial evaluation of colonies of Enterobacteriaceae?

    <p>MacConkey, HE, and XLD agars</p> Signup and view all the answers

    Which of the following is not true about Enterobacteriaceae?

    <p>Their colony morphology on BAP or CA is of great value in distinguishing them</p> Signup and view all the answers

    What is the basis of classification for Enterics?

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

    How are species further grouped within each Tribe?

    <p>By biochemical characteristics</p> Signup and view all the answers

    What is the purpose of grouping Enterobacteriaceae into Tribes?

    <p>To group species with similar characteristics</p> Signup and view all the answers

    Which of the following is not a part of the Enterobacteriaceae classification system?

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

    What is the O antigen in enteric bacteria?

    <p>Somatic and heat-stable antigen</p> Signup and view all the answers

    Which of the following contributes to the pathogenicity of enteric bacteria?

    <p>Ability to invade tissues</p> Signup and view all the answers

    What is the H antigen in enteric bacteria?

    <p>Flagellar antigen</p> Signup and view all the answers

    Which of the following is a heat-labile antigen in enteric bacteria?

    <p>Both b and c</p> Signup and view all the answers

    What is the function of plasmids in enteric bacteria?

    <p>To mediate resistance to antibiotics</p> Signup and view all the answers

    Which of the following antigens is located in the cell wall of enteric bacteria?

    <p>O antigen</p> Signup and view all the answers

    What is the meaning of 'fecal coliforms' in reference to Enterics?

    <p>Enterics found in the feces of animals and humans</p> Signup and view all the answers

    Where can Enterics be found besides the intestinal tract of animals and humans?

    <p>In the soil and water</p> Signup and view all the answers

    Study Notes

    Overview of Enterobacteriaceae

    • Enterobacteriaceae are classified as Gram-negative bacilli and do not form spores.
    • Commonly referred to as "Enterics," the family includes various pathogenic and non-pathogenic species.

    Key Features of Enterobacteriaceae

    • Major characteristics: ferment glucose and reduce nitrates to nitrites.
    • Enterobacteriaceae are predominantly oxidase-negative, with motility varied among species.

    Identification and Biochemical Testing

    • Escherichia species are motile, while Klebsiella, Shigella, and Yersinia are non-motile.
    • The nitrate reduction test is vital for distinguishing Enterobacteriaceae from other Gram-negative bacteria.
    • Colony morphology on Blood Agar Plates (BAP) or Chocolate Agar (CA) has limited value, primarily helpful for identifying Klebsiella.

    Media for Primary Evaluation

    • Initial colony evaluation typically involves media like MacConkey, Hektoen Enteric (HE), and Xylose Lysine Deoxycholate (XLD) agars.

    Classification Structure

    • Enterobacteriaceae are classified into tribes, simplifying their classification based on shared characteristics.
    • Further grouping within each tribe is based on biochemical characteristics, not colony morphology.

    Antigenic Components

    • The O antigen is a somatic, heat-stable component found in the cell wall.
    • The H antigen serves as a flagellar antigen, while K antigens are part of the capsule.
    • Heat-labile antigens include both H and K types.

    Pathogenicity Factors

    • Pathogenic enteric bacteria often possess the ability to invade tissues, contrasting with non-pathogenic species.
    • Plasmids in enteric bacteria confer antibiotic resistance, critical for their survival.

    Environmental Presence

    • Fecal coliforms refer to Enterics found in feces of animals and humans, highlighting their significance in health and sanitation.
    • Beyond intestinal habitats, Enterics can also be located in soil and water, contributing to their environmental resilience and distribution.

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    Description

    Test your knowledge on Enterobacteriaceae with these multiple-choice questions. This quiz covers key characteristics, classifications, and terms related to this important family of bacteria. Perfect for students in microbiology courses.

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