Microbiology IMViC Tests Analysis
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Questions and Answers

Which bacterial species is identified as decarboxylating Lysine?

  • Enterobacter cloacae
  • Enterobacter agglomerans
  • Serratia marcescens (correct)
  • Klebsiella pneumoniae (correct)

    • What does a positive result in the PR Sucrose test indicate about a bacteria?

  • The bacteria is motile.
  • The bacteria cannot decarboxylate Ornithine.
  • The bacteria is Gram-negative.
  • The bacteria ferments sucrose. (correct)

    • Which test indicates if an organism ferments glucose and produces hydrogen?

  • Lysine Decarboxylase
  • PR Sucrose
  • Motility
  • PR Glucose w/ Gas (correct)

    • Which species shows motility based on the results?

    <p>Klebsiella pneumoniae (C), Enterobacter cloacae (D)</p> Signup and view all the answers

    What does a box filled with a positive sign (+) signify in the results table?

    <p>The organism decarboxylates the tested amino acid. (D)</p> Signup and view all the answers

    Which of the following bacteria is Gram-positive?

    <p>Klebsiella pneumoniae (B)</p> Signup and view all the answers

    What does the variable result (+/-) represent about an organism?

    <p>The result is ambiguous and may vary. (B)</p> Signup and view all the answers

    Which bacterium has a positive result in both the Ornithine Decarboxylase and Motility tests?

    <p>Serratia marcescens (A), Klebsiella pneumoniae (B)</p> Signup and view all the answers

    Flashcards

    Bacterial Identification Tests

    A series of tests used to determine bacterial species based on their biochemical properties.

    Lysine Decarboxylase Test

    A test to determine if a bacterium converts Lysine into a different molecule.

    PR Sucrose Test

    Checks if a bacterium can ferment sucrose and produce acid.

    Ornithine Decarboxylase Test

    A test that identifies organisms that convert Ornithine into another chemical.

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    Motility Test

    Determines if a bacterium can move independently.

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    PR Glucose w/ Gas Test

    Tests if a bacterium ferments glucose and produces gas as a byproduct.

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    Gram-positive/Gram-negative

    Two categories of bacteria based on the cell wall structure revealed during staining.

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    Biochemical Characteristics

    The specific chemical reactions and processes that an organism can perform.

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    Study Notes

    IMViC Results

    • IMViC tests are used to identify bacteria based on their metabolic reactions.

    Figure 1

    • Lysine Decarboxylase:

      • Enterobacter agglomerans group: Negative
      • Enterobacter cloacae: Positive
      • Enterobacter taylorae: Negative
      • Klebsiella pneumoniae: Positive
      • Serratia marcescens: Positive

    • PR Sucrose:

      • Enterobacter taylorae: Positive

    • Motility:

      • Enterobacter agglomerans group: Negative
      • Enterobacter cloacae: Negative
      • Enterobacter taylorae: Negative
      • Klebsiella pneumoniae: Positive
      • Serratia marcescens: Positive

    • Ornithine Decarboxylase:

      • Enterobacter agglomerans group: Positive
      • Enterobacter cloacae: Positive
      • Enterobacter taylorae: Negative

    • PR Glucose w/ Gas:

      • Enterobacter aerogenes: Positive
      • Klebsiella pneumoniae: Negative
      • Serratia marcescens: Negative

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    Description

    This quiz focuses on the IMViC tests used for identifying various bacteria based on metabolic reactions. You will explore results from different bacterial strains to understand their characteristics in relation to IMViC test outcomes.

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