Genetic Diversity in Immunoglobulin Genes
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Questions and Answers

What is the consequence of adding G after CGA in the sequence GCG.CGA?

  • The sequence changes to GCG.CGA.UAA and translates to Ala.Arg.Stop
  • The sequence changes to GCG.CGA.GAA.UA and translates to Ala.Arg.Glu (correct)
  • The sequence changes to GCG.CGA.AUA and translates to Ala.Arg.Ile
  • The sequence changes to GCG.CGA.CAA.UA and translates to Ala.Arg.Gln

What happens when any heavy chain associates with any light chain in the generation of diversity?

  • It creates further variability (correct)
  • It results in identical antibody production
  • It leads to a decrease in the number of different heavy and light chains
  • It reduces the antibody diversity

When do the processes of random assortment of heavy and light chains occur?

  • Before the cell encounters antigen (correct)
  • During somatic hypermutation
  • After the B cell undergoes isotype switching
  • After the B cell encounters antigen

What type of antibody is produced by the B cell progeny as its first antibody?

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

What mediates the process of somatic hypermutation?

<p>IL-4 (D)</p> Signup and view all the answers

Which enzyme is involved in the process of isotype switch?

<p>Activation-induced cytidine deaminase (AID) (A)</p> Signup and view all the answers

What happens in the absence of AID?

<p>High levels of serum IgM and low levels of other isotypes (C)</p> Signup and view all the answers

What happens to the B cell if it possesses increased binding affinity due to somatic hypermutation?

<p>It will be positively selected and the clone will proliferate (C)</p> Signup and view all the answers

Which type of antigen does not require somatic hypermutation in the responding B cell?

<p>T-independent antigen (D)</p> Signup and view all the answers

What is the role of the enzymes RAG-1 and RAG-2 in the generation of diversity?

<p>They function to separate, shuffle, and rejoin the VDJ genes (D)</p> Signup and view all the answers

What is the difference between heavy chain genes and light chain genes?

<p>Heavy chain genes have V, D, and J segments, while light chain genes have only V and J segments (B)</p> Signup and view all the answers

Which enzymes are involved in the random recombination of VJ and VDJ gene segments?

<p>RAG-1 and RAG-2 (D)</p> Signup and view all the answers

Which process involves DNA cleavage and the addition or deletion of nucleotides to create a joint?

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

What is the function of terminal deoxynucleotidyl transferase (TdT) in junctional diversity?

<p>It adds nucleotides randomly (B)</p> Signup and view all the answers

What would happen if there is an absence of RAG-1 and RAG-2 enzymes?

<p>Failure to generate immunoglobulins, BCRs or TCRs (A)</p> Signup and view all the answers

What is the main factor contributing to the theoretical diversity of gene combinations?

<p>The number of VDJ gene segments (C)</p> Signup and view all the answers

What is the role of exonuclease in junctional diversity?

<p>It deletes nucleotides randomly (D)</p> Signup and view all the answers

What happens if there is an absence of terminal deoxynucleotidyl transferase (TdT) in junctional diversity?

<p>Reduced junctional diversity (A)</p> Signup and view all the answers

Which enzyme products are responsible for the separation, shuffling, and rejoining of VDJ genes?

<p>RAG-1 and RAG-2 (D)</p> Signup and view all the answers

How does the generation of germline diversity occur?

<p>Through random recombination of VJ and VDJ gene segments (B)</p> Signup and view all the answers

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