Genetics: Inducible and Repressible Systems
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Questions and Answers

What is the main function of an operon in bacteria?

  • Code for transport proteins
  • Code for structural genes
  • Code for enzymes in a related metabolic pathway (correct)
  • Code for regulatory proteins
  • Where is the operator located in relation to the promoter and structural genes in an operon?

  • Upstream of the promoter
  • At the end of the operon
  • Between the promoter and structural gene (correct)
  • Downstream of the promoter
  • What binds to the operator to inhibit transcription of structural genes in an operon?

  • RNA polymerase
  • mRNA
  • Active repressor protein (correct)
  • Ribosomes
  • Which of the following is NOT an advantage of the operon model?

    <p>Individual gene regulation</p> Signup and view all the answers

    Where are regulatory genes, which code for regulatory proteins, typically located in relation to an operon?

    <p>Upstream of the operon</p> Signup and view all the answers

    Which type of operon system allows transcription to occur only when an inducer is present?

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

    What is the main characteristic of an inducible operon?

    <p>It requires an inducer to activate transcription</p> Signup and view all the answers

    Which of the following represents a distinguishing feature of the Trp operon?

    <p>The repressor binds to a co-repressor</p> Signup and view all the answers

    In a repressible operon, what happens when the co-repressor binds to the repressor?

    <p>The repressor becomes inactive</p> Signup and view all the answers

    Which type of metabolic pathway is associated with an inducible operon?

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

    What role does the inducer play in an inducible operon?

    <p>It inactivates the repressor by changing its conformation</p> Signup and view all the answers

    What happens when the repressor cannot bind to the operator in a repressible system?

    <p>Transcription is activated</p> Signup and view all the answers

    What is the function of an inducer in a bacterial operon system?

    <p>Inactivates the repressor protein</p> Signup and view all the answers

    Which type of gene is responsible for encoding products required in basic cellular processes and is expressed all the time?

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

    In a repressible system, what role does a corepressor play?

    <p>Inactivates the repressor protein</p> Signup and view all the answers

    What is the function of polycistronic mRNA in gene expression?

    <p>Encodes multiple proteins in the same pathway</p> Signup and view all the answers

    What does an operator site on DNA do in relation to gene expression?

    <p>Prevents transcription initiation at adjacent promoters</p> Signup and view all the answers

    Which type of gene codes for proteins involved in regulating the expression of other genes?

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

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