Exploring the World of Gram Positive Cocci
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Questions and Answers

Which type of bacteria are considered 'ubiquitous' in nature and can be found in various body sites of humans and animals?

  • Gram positive bacilli
  • Gram negative cocci
  • Gram positive cocci (correct)
  • Gram negative bacilli

    • What type of staining is used to identify Gram positive cocci?

  • Acid-fast staining
  • Negative staining
  • Gram staining (correct)
  • Endospore staining

    • Which type of agar is commonly used for the isolation of Gram positive cocci?

  • Mannitol salt agar
  • Blood agar (correct)
  • MacConkey agar
  • Eosin methylene blue agar

    • Which of the following is a characteristic of Staphylococcus aureus?

    <p>GPC grapelike clusters</p> Signup and view all the answers

    Which of the following infections can be caused by Staphylococcus aureus?

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

    Which of the following is a characteristic of Staphylococcus epidermidis?

    <p>Commensal on human skin</p> Signup and view all the answers

    Which of the following is a predisposing factor for opportunistic Staphylococcus infections?

    <p>Presence of foreign bodies, sutures, IV's</p> Signup and view all the answers

    Which of the following is a characteristic of Staphylococcus aureus?

    <p>Breaks down red blood cells completely</p> Signup and view all the answers

    Which of the following infections is caused by Staphylococcus aureus?

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

    Which of the following is a characteristic of Staphylococcus epidermidis?

    <p>Forms biofilms on medical implants</p> Signup and view all the answers

    Which of the following is a predisposing factor for opportunistic Staphylococcus infections?

    <p>All of the above</p> Signup and view all the answers

    Which of the following is a disease caused by Staphylococcus aureus?

    <p>All of the above</p> Signup and view all the answers

    Which of the following is a characteristic of Staphylococcus saprophyticus?

    <p>Causes urinary tract infections in young women</p> Signup and view all the answers

    Which of the following is a characteristic of Staphylococcus lugdunensis?

    <p>Forms grapelike clusters</p> Signup and view all the answers

    Which of the following is a characteristic of Staphylococcus epidermidis?

    <p>Forms biofilms on medical implants</p> Signup and view all the answers

    Which of the following is a characteristic of Staphylococcus saprophyticus?

    <p>Causes urinary tract infections in young women</p> Signup and view all the answers

    Which of the following is a characteristic of Staphylococcus lugdunensis?

    <p>Forms grapelike clusters</p> Signup and view all the answers

    Which of the following is a characteristic of Gram positive cocci?

    <p>They have a thick Gram positive cell wall</p> Signup and view all the answers

    Which type of agar is commonly used for the isolation of Gram positive cocci?

    <p>Columbia sheep blood agar</p> Signup and view all the answers

    Which of the following is true about the atmospheric requirements of Gram positive cocci?

    <p>They are facultative anaerobes</p> Signup and view all the answers

    Which group of antibiotics is effective against Gram positive cocci?

    <p>Beta lactam antibiotics</p> Signup and view all the answers

    What is the main function of techoic acids in Gram positive cocci?

    <p>Contribute to the Gram positive cell wall</p> Signup and view all the answers

    Which of the following is NOT a media commonly used for the isolation of Gram positive cocci?

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

    What is the role of beta lactam antibiotics in inhibiting the growth of Gram positive cocci?

    <p>They interfere with cell wall synthesis</p> Signup and view all the answers

    Which of the following is a characteristic of Gram positive cocci stains?

    <p>They do not retain crystal violet and stain lighter shades of blue purple to pink</p> Signup and view all the answers

    Which of the following is NOT true about Gram positive cocci?

    <p>They are resistant to beta lactam antibiotics</p> Signup and view all the answers

    What is the significance of Gram positive cocci being considered 'ubiquitous'?

    <p>They are found all over the place</p> Signup and view all the answers

    Which of the following is a characteristic of Gram positive cocci?

    <p>They are commonly found in the environment</p> Signup and view all the answers

    What is the primary staining method used to identify Gram positive cocci?

    <p>Crystal violet</p> Signup and view all the answers

    Which of the following media is commonly used for the isolation of Gram positive cocci?

    <p>Columbia sheep blood agar</p> Signup and view all the answers

    What is the role of techoic acids in Gram positive cocci?

    <p>They contribute to the Gram positive cell wall structure</p> Signup and view all the answers

    Which group of antibiotics is effective against Gram positive cocci?

    <p>Beta lactam antibiotics</p> Signup and view all the answers

    What is the atmospheric requirement for the growth of Gram positive cocci?

    <p>Facultative anaerobe</p> Signup and view all the answers

    Which of the following is a characteristic of Staphylococcus aureus?

    <p>It is a common cause of skin and soft tissue infections</p> Signup and view all the answers

    Which of the following is a predisposing factor for opportunistic Staphylococcus infections?

    <p>Immunocompromised state</p> Signup and view all the answers

    What is the main function of beta lactam antibiotics in inhibiting the growth of Gram positive cocci?

    <p>Interfering with cell wall synthesis</p> Signup and view all the answers

    Which of the following infections can be caused by Staphylococcus aureus?

    <p>Skin and soft tissue infections</p> Signup and view all the answers

    Which of the following is a characteristic of Staphylococcus aureus?

    <p>It produces a green pigment due to the breakdown of red blood cells.</p> Signup and view all the answers

    Which of the following is a disease caused by Staphylococcus aureus?

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

    What is the main function of teichoic acids in Gram-positive cocci?

    <p>To provide structural support to the cell wall</p> Signup and view all the answers

    Which group of antibiotics is effective against Gram-positive cocci?

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

    Which of the following is a characteristic of Staphylococcus saprophyticus?

    <p>It causes urinary tract infections in sexually active young women.</p> Signup and view all the answers

    What is the role of beta-lactam antibiotics in inhibiting the growth of Gram-positive cocci?

    <p>They inhibit the synthesis of peptidoglycan in the cell wall of the bacteria.</p> Signup and view all the answers

    Which of the following is NOT true about Gram-positive cocci?

    <p>They are resistant to vancomycin.</p> Signup and view all the answers

    Which type of agar is commonly used for the isolation of Gram-positive cocci?

    <p>Blood agar</p> Signup and view all the answers

    Which of the following is a characteristic of Staphylococcus epidermidis?

    <p>It is a common cause of skin infections.</p> Signup and view all the answers

    Which of the following infections can be caused by Staphylococcus aureus?

    <p>Respiratory tract infections</p> Signup and view all the answers

    Which of the following is a clinical effect caused by enterotoxins produced by Staphylococcus aureus?

    <p>Diarrhea and vomiting</p> Signup and view all the answers

    Which of the following is a characteristic of toxic shock syndrome toxin-1 (TSST-1) produced by Staphylococcus aureus?

    <p>It is absorbed through the vaginal mucosa</p> Signup and view all the answers

    Which of the following is a clinical effect caused by exfoliative toxins produced by Staphylococcus aureus?

    <p>Skin sloughing</p> Signup and view all the answers

    Which of the following is a characteristic of cytolytic toxins produced by Staphylococcus aureus?

    <p>They affect leukocytes</p> Signup and view all the answers

    Which enzyme is commonly found in all Staphylococcus species?

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

    Which protein, found in the cell wall of Staphylococcus aureus, can bind and neutralize the Fc portion of IgG?

    <p>Protein A</p> Signup and view all the answers

    Which virulence factor of Staphylococcus aureus resists phagocytosis?

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

    Which extracellular substance, produced by all Staphylococcus species, contributes to biofilms generated on plastic, catheters, and foreign objects?

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

    Which bacterial enzyme is commonly found in most aerobic and facultative anaerobic organisms other than Streptococcus species?

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

    Which of the following is a characteristic of Staphylococcus aureus?

    <p>It produces TSST-1</p> Signup and view all the answers

    Which of the following is a positive result for the catalase test?

    <p>Bubbling immediately after adding 3% H2O2</p> Signup and view all the answers

    Which of the following is a negative result for the coagulase slide test?

    <p>No clumping</p> Signup and view all the answers

    Which of the following is a positive result for the DNAse test?

    <p>Clearing or halo around the colony spot</p> Signup and view all the answers

    Which of the following is a negative result for the oxidase test?

    <p>No color development</p> Signup and view all the answers

    Which of the following is a resistant result for the bacitracin test?

    <p>Growth up to the edge of the disc</p> Signup and view all the answers

    Which of the following is a fermentative result for the glucose OF oxidation/fermentation test?

    <p>Acid production in the open tube only</p> Signup and view all the answers

    Which of the following is a positive result for the latex agglutination test?

    <p>Clumping in less than 10 seconds</p> Signup and view all the answers

    Which of the following is a negative result for the novobiocin susceptibility test?

    <p>No zone of inhibition</p> Signup and view all the answers

    Which of the following is a characteristic of Staphylococcus saprophyticus?

    <p>Negative result for the coagulase slide test</p> Signup and view all the answers

    Which of the following is a characteristic of Staphylococcus epidermidis?

    <p>Negative result for the coagulase slide test</p> Signup and view all the answers

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