lecture 12 multiple chocie quiz- immuology
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Questions and Answers

Which process involves the random recombination of gene segments in lymphocytes?

  • Proliferation
  • Antigen receptor gene rearrangement (correct)
  • Maturation
  • Selection

What is responsible for the generation of a diverse and competent immune system in humans?

  • B cell migration
  • Hematopoietic stem cells
  • Antigen receptor gene rearrangement (correct)
  • Thymus migration

Where does the maturation of lymphocytes into fully functional cells occur?

  • Peripheral lymphoid organs (correct)
  • Thymus
  • Bone marrow
  • Spleen

What is the role of the thymus in lymphocyte maturation?

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

How do B cell and T cell clones achieve unique antigen receptors despite a relatively small number of genes coding for them?

<p>(V(D)J recombination (A)</p> Signup and view all the answers

What is the key step in both B and T cell maturation?

<p>Sequential rearrangement (recombination) of antigen receptor genes (D)</p> Signup and view all the answers

Where does B cell undergo V(D)J recombination to assemble immunoglobulin genes?

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

Which cells are eliminated during negative selection in lymphocyte maturation?

<p>Cells that strongly recognize self-antigens (D)</p> Signup and view all the answers

What do mature B cells differentiate into based on their antigen encounter?

<p>Plasma cells or memory B cells (B)</p> Signup and view all the answers

What is the purpose of positive selection in the thymus and bone marrow?

<p>To select cells expressing antigen receptors with moderate affinity for self-antigens (B)</p> Signup and view all the answers

What is the purpose of V(D)J recombination in lymphocytes?

<p>To generate diversity in B and T cell receptors before encountering specific antigens (A)</p> Signup and view all the answers

Which gene segments are involved in the heavy chain of human immunoglobulins?

<p>V, D, J (A)</p> Signup and view all the answers

What is the role of Complementarity-Determining Regions (CDRs) in antigen recognition?

<p>They form the antigen-binding site in immunoglobulins (A)</p> Signup and view all the answers

During which stage of lymphocyte maturation do immature B cells express B cell receptors (BCRs)?

<p>Immature B cell stage (A)</p> Signup and view all the answers

What does the germline organization of human Ig heavy chain include?

<p>Variable, Diversity, Joining segments (A)</p> Signup and view all the answers

What is the main process that initiates the generation of a diverse repertoire of antigen receptors in B cells?

<p>V(D)J recombination of immunoglobulin genes (C)</p> Signup and view all the answers

What serves as a checkpoint for the selection of cells capable of generating functional antigen receptors?

<p>Expression of pre-antigen receptors on the surface (C)</p> Signup and view all the answers

Which type of lymphocyte expresses functional antigen receptors on their surface?

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

What is the role of the selection process in pre-lymphocytes with moderate affinity for self-antigens?

<p>To eliminate cells with non-functional receptors (B)</p> Signup and view all the answers

Which process helps ensure the presence of a diverse and functional repertoire of antigen receptors in lymphocytes?

<p>Maturation and selection processes in immature lymphocytes (D)</p> Signup and view all the answers

During lymphocyte maturation, which process involves the commitment of progenitor cells to either the B lymphoid or T lymphoid lineage?

<p>Proliferation of progenitor cells (A)</p> Signup and view all the answers

Which stage of lymphocyte maturation involves the migration of T lymphoid progenitors to the thymus for further development?

<p>Commitment to B or T Lymphoid Lineage (A)</p> Signup and view all the answers

What drives the rapid proliferation of progenitor cells upon commitment to the B or T cell lineage during lymphocyte maturation?

<p>Growth factors and cytokines in the microenvironment (D)</p> Signup and view all the answers

Which process in lymphocyte maturation involves the sequential rearrangement (recombination) of antigen receptor chains?

<p>Proliferation of progenitor cells (B)</p> Signup and view all the answers

What happens during the differentiation stage of lymphocyte maturation?

<p>Selection of Cells Expressing Functional Antigen Receptors &amp; Elimination of Cells that Strongly Recognize Self Antigens (C)</p> Signup and view all the answers

What is the process that involves the commitment of hematopoietic stem cells to the lymphoid lineage?

<p>Initiation of Antigen Receptor Gene Rearrangement (A)</p> Signup and view all the answers

Which factor plays a role in inducing commitment of hematopoietic stem cells to the lymphoid lineage?

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

What is the main characteristic of pro-lymphocytes?

<p>Potential to differentiate into B or T cells (C)</p> Signup and view all the answers

Which stage of lymphocyte maturation involves the sequential rearrangement of antigen receptor genes?

<p>Initiation of Antigen Receptor Gene Rearrangement (D)</p> Signup and view all the answers

What is the primary function of lymphocyte maturation?

<p>Maintaining self-tolerance (C)</p> Signup and view all the answers

Which segments are randomly rearranged during V(D)J recombination to form a functional gene encoding the variable region of the antigen receptor?

<p>Variable (V), Diversity (D), and Joining (J) segments (A)</p> Signup and view all the answers

Which cells utilize V(D)J recombination to generate diversity in their antigen receptor genes?

<p>Both B cells and T cells (A)</p> Signup and view all the answers

Which of the following is true regarding the gene rearrangement process in lymphocytes?

<p>The details are the same for both Ig heavy chains and TCR chains. (D)</p> Signup and view all the answers

Where does the process of antigen receptor gene rearrangement crucial for generating diverse B cell and T cell receptors occur?

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

Which of the following statements is correct about the antigen receptor gene rearrangement in lymphocytes?

<p>It occurs after antigens have been encountered. (A)</p> Signup and view all the answers

Why is the process of antigen receptor gene rearrangement crucial for lymphocytes?

<p>To produce receptors that recognize a wide range of antigens. (B)</p> Signup and view all the answers

Which region of each antigen receptor is generated by combining different gene segments during V(D)J recombination?

<p><strong>Variable region</strong> (A)</p> Signup and view all the answers

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