Immunology: Chapter 6 Overview
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Questions and Answers

Which division of the immune system is inborn, non-specific, and does not have memory?

  • Adaptive immunity
  • Innate immunity (correct)
  • Humoral immunity
  • Cellular immunity

What is the first line of defense in the innate immune response that includes mechanical and chemical barriers?

  • Interferon
  • Humoral components
  • Mechanical barriers (correct)
  • Phagocytosis

Which of the following is a humoral (soluble) component in the second line of the innate immune response?

  • C-reactive protein (CRP)
  • Complement (correct)
  • Lysozyme
  • Interferon

What is the process of engulfing bacteria after entering blood or tissue fluid in the immune system known as?

<p>Phagocytosis (A)</p> Signup and view all the answers

Which component creates an acidic pH in the adult female vaginal, serving as a biological barrier in the immune system?

<p>Lactobacilli (C)</p> Signup and view all the answers

Which division of the immune system is acquired, specific, and has delayed memory?

<p>Adaptive immunity (A)</p> Signup and view all the answers

Which type of immune response is mediated by antibodies secreted by B lymphocytes?

<p>Humoral immune response (D)</p> Signup and view all the answers

Which type of antigen includes substances like bacterial cell wall and viral particles?

<p>Viral, fungal, and parasitic antigen (D)</p> Signup and view all the answers

Which class of immunoglobulins constitutes approximately 75% of all immunoglobulins?

<p>IgG (A)</p> Signup and view all the answers

Which type of immune response is mediated by T-lymphocytes and eliminates intracellular microbes like viruses?

<p>T-cytotoxic cell response (B)</p> Signup and view all the answers

Which class of immunoglobulins is mainly involved in primary immune responses?

<p>IgM (D)</p> Signup and view all the answers

Which type of antigen includes substances like portions of milk and blood groups?

<p>Human antigen (A)</p> Signup and view all the answers

Which enzyme produced by Staphylococcus aureus causes the lysis of erythrocytes?

<p>Coagulase enzyme (C)</p> Signup and view all the answers

What is the characteristic appearance of Staphylococcus aureus colonies on mannitol salt agar?

<p>Golden yellow (B)</p> Signup and view all the answers

In which type of infections does Staphylococcus aureus commonly cause abscesses and boils?

<p>Pyogenic infections (C)</p> Signup and view all the answers

What is the morphology of Staphylococcus aureus?

<p>Gram-positive spherical cocci (A)</p> Signup and view all the answers

Which agar shows beta hemolysis when Staphylococcus aureus is cultured?

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

Which virulence factor of Staph. aureus causes food poisoning?

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

What is the classification of streptococci based on the type of hemolysis on blood agar?

<p>Beta hemolytic streptococci (D)</p> Signup and view all the answers

Which virulence factor of Streptococcus pyogenes protects bacteria against phagocytosis?

<p>M protein (D)</p> Signup and view all the answers

Which disease is caused by Streptococcus pyogenes and presents as cellulitis infection of the deep layer of the skin?

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

What is the laboratory specimen used for the diagnosis of Neisseria infections?

<p>Throat swabs (A)</p> Signup and view all the answers

Which type of streptococci exhibits complete hemolysis (clear zone) on blood agar?

<p>Beta hemolytic streptococci (D)</p> Signup and view all the answers

Which enzyme produced by Streptococcus pyogenes is used in the treatment of pulmonary emboli?

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

What is the morphology of Neisseria bacteria?

<p>Gram negative cocci (B)</p> Signup and view all the answers

What is the characteristic cultural feature of Streptococcus pyogenes on blood agar?

<p>Beta hemolysis ( clear zone ) (C)</p> Signup and view all the answers

What is the function of Streptolysin produced by Streptococcus pyogenes?

<p>Hemolysis (A)</p> Signup and view all the answers

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