Gene Regulation and Expression Control
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Questions and Answers

What is the role of a repressor protein in gene regulation?

  • It binds to the inducer and reduces its activity
  • It binds to the RNA polymerase and enhances its activity
  • It binds to the promoter and increases transcription
  • It binds to the operator and prevents transcription (correct)

    • What type of pathways are usually characterized by the presence of a gene product inhibiting gene expression?

  • Constitutive pathways
  • Repressible pathways (correct)
  • Inducible pathways
  • Regulatory pathways

    • What is the function of an activator protein in gene regulation?

  • It reduces the activity of an inducer molecule
  • It inhibits the binding of RNA polymerase to the promoter
  • It enhances the binding of RNA polymerase to the promoter (correct)
  • It represses the transcription of a gene

    • What is the role of the end product tryptophan in the anabolic pathway that leads to its synthesis?

    <p>It inhibits the gene expression (D)</p> Signup and view all the answers

    What is the term used to describe genes that are switched on in response to an external stimulus?

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

    What is the term for the molecule that binds to the repressor, enabling it to bind to DNA and cause repression of gene expression?

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

    What is the role of an inducer molecule in gene regulation?

    <p>It binds to the repressor protein and inhibits its activity (C)</p> Signup and view all the answers

    What is the term used to describe the mechanism by which genes are turned off in response to an external stimulus?

    <p>Negative control mechanism (C)</p> Signup and view all the answers

    In negative regulation, what is the default state of RNA production?

    <p>It is active (D)</p> Signup and view all the answers

    What is the term used to describe the process of switching on and off gene expression in response to environmental changes?

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

    What is the term for the regulator molecule that directly stimulates RNA production in positive regulation?

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

    What is the purpose of the inhibitor in gene regulation?

    <p>To prevent the activator from binding to DNA (B)</p> Signup and view all the answers

    What is the role of a small effector molecule in genetic regulatory proteins?

    <p>It brings about conformational changes in the regulatory protein (A)</p> Signup and view all the answers

    What type of enzymes are produced in response to the presence of lactose in E. coli?

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

    What is the role of regulatory proteins in gene expression?

    <p>To activate or block transcription (A)</p> Signup and view all the answers

    What is the term for the process by which the production of an enzyme is increased in response to the presence of its substrate?

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

    Who proposed the operon model for the regulation of gene expression in E. coli?

    <p>Francois Jacob and Jacques Monod (C)</p> Signup and view all the answers

    What is the term for the enzymes that are present in negligible amounts in the absence of their substrate?

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

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