Micrococci and Streptococci Characteristics Quiz
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Questions and Answers

What differentiates micrococci from staphylococci in terms of their appearance?

  • Micrococci are motile, but staphylococci are non-motile.
  • Micrococci are smaller than staphylococci.
  • Micrococci appear in tetrads, while staphylococci appear in clusters. (correct)
  • Micrococci are gram-negative, and staphylococci are gram-positive.
  • Which of the following is a characteristic of streptococci?

  • Catalase-positive
  • Motile bacteria
  • Facultative anaerobes (correct)
  • Spore-forming bacteria
  • What is the main product of glucose fermentation by homofermentative streptococci?

  • Carbon dioxide
  • Ethanol
  • Lactic acid (correct)
  • Acetic acid
  • Which streptococci are exceptions by being pigmented?

    <p>S. agalactiae</p> Signup and view all the answers

    Where are viridans group streptococci typically located in the body?

    <p>Upper respiratory tract</p> Signup and view all the answers

    Based on Bergey’s Classification, which group of streptococci fails to grow at 10°C but can be recovered at temperatures up to 45°C?

    <p>Viridans group</p> Signup and view all the answers

    What type of test is used to identify Group B Streptococci?

    <p>CAMP Test</p> Signup and view all the answers

    How is Group B Streptococci transmitted during birth?

    <p>Through the colonized birth canal</p> Signup and view all the answers

    Which enzyme dissolves hyaluronic acid in the host's connective tissue?

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

    What is a characteristic of Group B Streptococci as mentioned in the text?

    <p>It may be encapsulated</p> Signup and view all the answers

    What is the role of Streptokinase in the pathogen's activities?

    <p>Converts plasminogen into plasma</p> Signup and view all the answers

    Which test is used for scarlet fever susceptibility?

    <p>Dick's Test</p> Signup and view all the answers

    What is the typical appearance of metachromatic granules in the cytoplasm of the rod under a stained smear?

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

    Which of the following is NOT a characteristic of diphtheria caused by toxigenic strains of C.diphtheriae?

    <p>Incubation period of 7 days</p> Signup and view all the answers

    In which anatomical sites is respiratory diphtheria most commonly found?

    <p>Pharynx and tonsils</p> Signup and view all the answers

    What is the habitat of the bacteria that causes diphtheria?

    <p>Human nasopharynx</p> Signup and view all the answers

    Which characteristic is NOT associated with the clinical manifestation of diphtheria?

    <p>Characterized by skin lesions</p> Signup and view all the answers

    What gives the rod a 'Chinese letters' or 'palisades' appearance under microscopic observation?

    <p>Arrangement of cells at angles to one another</p> Signup and view all the answers

    What is the most common E.rhusiopathiae infection in humans?

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

    How do humans usually acquire E.rhusiopathiae infection?

    <p>Direct inoculation from animals or animal products</p> Signup and view all the answers

    Which occupation group is at the greatest risk of E.rhusiopathiae infection?

    <p>Fishermen and fish handlers</p> Signup and view all the answers

    What is the characteristic appearance of E.rhusiopathiae colonies in a gelatin stab culture?

    <p>&quot;Molar tooth&quot;</p> Signup and view all the answers

    How can swine erysipelas be prevented?

    <p>Vaccinating pigs</p> Signup and view all the answers

    What is the majority characteristic of Lactobacillus species related to antibiotic resistance?

    <p>Vancomycin resistant</p> Signup and view all the answers

    What crystal formation is used to differentiate B. thuringiensis from B. cereus?

    <p>Cuboid or diamond-shaped crystals adjacent to the spore</p> Signup and view all the answers

    Which characteristic helps distinguish Clostridium perfringens from other Clostridium species?

    <p>&quot;Box Car appearance&quot; of the colony</p> Signup and view all the answers

    Which agar medium shows a double zone of hemolysis due to hemolysin and tetanolysin production?

    <p>Nutrient agar with MnSO4</p> Signup and view all the answers

    Which of the following characteristics is NOT true for Bacillus cereus?

    <p>&quot;Snow-shoe&quot; shaped spores</p> Signup and view all the answers

    What is a distinguishing characteristic of Bacillus subtilis?

    <p>&quot;Barnyard odor&quot; during culture incubation</p> Signup and view all the answers

    Which of these organisms shows a reverse CAMP test (bowtie) result?

    <p>Clostridium perfringens</p> Signup and view all the answers

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