Endotoxin Characteristics Quiz
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Questions and Answers

What is the main function of endotoxin in Gram-negative bacteria?

  • Facilitating the reproduction of the bacteria
  • Regulating the metabolic processes within the bacteria
  • Maintaining the organization and stability of the cell wall (correct)
  • Preventing the entry of other microorganisms into the bacteria

    • What is the typical pyrogenic characteristic of endotoxin?

  • Causing rapid reproduction of Gram-negative bacteria
  • Inactivating complement, kinin system, and leukocytes
  • Preventing the release of endotoxin into the circulation
  • Inducing various biological reactions even in small amounts (correct)

    • What symptoms may be caused by the presence of endotoxin in the bloodstream?

  • Muscle pain, dizziness, and fatigue
  • Cough, runny nose, and headache
  • Skin rash, itching, and shortness of breath
  • Fever, hypotension, nausea, shivering, and shock (correct)

    • Why is it not possible to completely inactivate endotoxin with autoclaving?

    <p>Due to its heat resistance and stability</p> Signup and view all the answers

    Where can endotoxin be found in the environment?

    <p>Water and air inhabited by Gram-negative bacteria</p> Signup and view all the answers

    Which component of LPS is responsible for the bioactivity of LPS?

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

    What is the role of LpxB in the lipid A biosynthesis pathway?

    <p>Responsible for the condensation of lipid X with UDP-2,3-diacylglucosamine</p> Signup and view all the answers

    Which bacteria produce A-B toxins?

    <p>Clostridium tetani, Clostridium diphtheria, Vibrio cholerae, Staph. aureus, Shigella flexneri</p> Signup and view all the answers

    What is the main role of part A in A-B toxins?

    <p>Active enzymatic component altering the functions of host cells through inhibition of protein synthesis</p> Signup and view all the answers

    What is the mechanism of action of Superantigens?

    <p>Bind to MHC class II molecules and T-cell receptor outside the antigen recognition site</p> Signup and view all the answers

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