lecture 12 multiple chocie quiz- immuology
37 Questions
0 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

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

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

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

    Which cells are eliminated during negative selection in lymphocyte maturation?

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

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

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

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

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

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

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

    What is the main characteristic of pro-lymphocytes?

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

    What is the primary function of lymphocyte maturation?

    <p>Maintaining self-tolerance</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</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</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.</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</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.</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.</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></p> Signup and view all the answers

    More Like This

    Use Quizgecko on...
    Browser
    Browser