Lecture 7: B cells
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Questions and Answers

Which type of cells mostly produce IgM (with some IgD) in the primary response?

  • Memory B cells
  • Germinal center B cells
  • Plasma cells (correct)
  • Naive B cells

What is the main isotype expressed by most memory B cells according to the text?

  • IgA
  • IgG (correct)
  • IgE
  • IgM

What happens to the affinity of antibodies with repeated immunization?

  • Decreases
  • Increases (correct)
  • Fluctuates
  • Stays the same

Which type of B cells will outcompete the primary response due to their increased affinity?

<p>Memory B cells (D)</p> Signup and view all the answers

What happens as the immune response progresses from secondary to tertiary responses?

<p>Tertiary response outcompetes primary response (B)</p> Signup and view all the answers

What is a distinguishing feature of central memory T cells?

<p>Rapid reactivation by second antigen exposure (C)</p> Signup and view all the answers

What is a functionally unique characteristic of memory T cells compared to naive T cells?

<p>Express different surface adhesion molecules (D)</p> Signup and view all the answers

Which cytokine can lead to increased expression of Bcl-2 in memory T cells?

<p>Interleukin-7 (IL-7) (B)</p> Signup and view all the answers

Which type of memory T cells contribute better to first-line defenses?

<p>Effector memory T cells (B)</p> Signup and view all the answers

What is the outcome of the experiment regarding CD8+ Memory T cells in MHCII deficient mice?

<p>Reduced maintenance compared to WT mice (B)</p> Signup and view all the answers

What role does CD4+ T cell activation with MHCII play in CD8+ T cell longevity?

<p>Increases longevity of CD8+ T cells (A)</p> Signup and view all the answers

What is the primary difference between active and passive immunization?

<p>Memory response is generated in active immunization, but not in passive immunization (B)</p> Signup and view all the answers

What is the purpose of adjuvants in vaccines?

<p>To promote inflammation and enhance the immune response to the vaccine (B)</p> Signup and view all the answers

Why do early childhood vaccinations typically start at 6 months of age?

<p>To allow acquired antibodies through passive transfer to die off before new ones are introduced (A)</p> Signup and view all the answers

What can happen with both passive and active immunization due to original antigenic sin?

<p>Production of ineffective antibodies and weak immunity (B)</p> Signup and view all the answers

Why do attenuated vaccines have built-in adjuvants?

<p>To trigger an immune response through pathogen-associated molecular patterns (PAMPs) (A)</p> Signup and view all the answers

What is the purpose of promoting some inflammation in weak antigen-stimulating situations?

<p>To recruit more immune cells and enhance effectiveness (B)</p> Signup and view all the answers

Why is a passive immunization considered temporary?

<p>It does not generate a memory response (D)</p> Signup and view all the answers

How do vaccines induce active immunity?

<p>By exposing individuals to non-dangerous forms of infectious agents purposefully (A)</p> Signup and view all the answers

How does herd immunity reduce the pathogen reservoir?

<p>By significantly reducing the number of susceptible individuals (A)</p> Signup and view all the answers

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