Operon and Gene Regulation Quiz
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Questions and Answers

What is the role of the cAMP receptor protein in the positive transcriptional control system?

  • The cAMP receptor protein is a regulatory gene product that codes for the expressor protein. (correct)
  • The cAMP receptor protein binds to the gene repressor to inhibit transcription.
  • The cAMP receptor protein binds to the operator locus to enable gene function.
  • The cAMP receptor protein is a co-repressor that binds to the RNAP to prevent promoter attachment.

    • What is the role of a co-repressor in the negative transcriptional control system?

  • The co-repressor binds to the gene expressor to activate transcription.
  • The co-repressor binds to the RNAP to prevent promoter attachment.
  • The co-repressor binds to the gene repressor to inhibit its binding to the operator locus. (correct)
  • The co-repressor is a regulatory gene product that codes for the expressor protein.

    • How does the RNAP and promoter attachment process work in the positive transcriptional control system?

  • The co-repressor protein binds to the RNAP to block its attachment to the promoter.
  • The cAMP receptor protein binds to the RNAP to prevent its attachment to the promoter.
  • The gene expressor protein binds to the RNAP to facilitate its attachment to the promoter. (correct)
  • The RNAP binds directly to the promoter to initiate transcription.

    • What is the role of the trp regulatory gene in the negative repressible system?

    <p>The trp regulatory gene codes for the gene repressor protein that binds to the operator locus to prevent transcription.</p> Signup and view all the answers

    How does the negative repressible system control gene expression?

    <p>The gene repressor protein is only produced when the substrate is present, and it binds to the operator locus to prevent transcription.</p> Signup and view all the answers

    What is the role of the operator locus in the negative inducible system?

    <p>The operator locus enables the gene repressor protein to bind to it and prevent transcription.</p> Signup and view all the answers

    What is the function of cAMP receptor protein (CRP) in the regulation of gene expression?

    <p>Facilitates attachment of RNA polymerase to the promoter</p> Signup and view all the answers

    In the tryptophan operon, what role does the trp regulatory gene (trp R) play?

    <p>Codes for a repressor protein sensitive to tryptophan levels</p> Signup and view all the answers

    What is the purpose of a co-repressor in a negative repressible system?

    <p>Inhibits gene expression when bound to a repressor</p> Signup and view all the answers

    How does RNAP affect gene transcription in prokaryotes?

    <p>Binds to the promoter with the help of cAMP receptor protein</p> Signup and view all the answers

    What happens when a suitable inducer (like allolactose) is present in an operon?

    <p>Removes the repressor from the operator to allow transcription</p> Signup and view all the answers

    Where does the CRP (cAMP receptor protein) bind to regulate gene expression in prokaryotes?

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

    What is the role of cAMP in the regulation of gene expression?

    <p>cAMP is a positive regulator that enhances the binding of RNAP to the promoter</p> Signup and view all the answers

    Which of the following best describes the role of CRP in the regulation of gene expression?

    <p>CRP is a positive regulator that enhances the binding of RNAP to the promoter</p> Signup and view all the answers

    What is the relationship between the presence of a co-repressor and the binding of the repressor protein to the control sequence?

    <p>The presence of the co-repressor causes the repressor protein to bind to the control sequence, turning the gene off</p> Signup and view all the answers

    What is the primary difference between an inducible operon and a repressible operon?

    <p>An inducible operon is turned on by the presence of an inducer, while a repressible operon is turned on by the absence of a co-repressor</p> Signup and view all the answers

    How does a mutation in the trp regulatory gene affect the expression of the trp operon?

    <p>A mutation in the trp regulatory gene would cause the trp operon to be permanently turned off</p> Signup and view all the answers

    What is the primary function of the capsid in a virus particle?

    <p>The capsid protects the viral genomic material from the host cell's defenses</p> Signup and view all the answers

    What is the primary difference between a lytic cycle and a lysogenic cycle in viral replication?

    <p>In a lytic cycle, the virus causes the host cell to lyse and release new viral particles, while in a lysogenic cycle, the virus remains dormant within the host cell</p> Signup and view all the answers

    Which of the following is a common feature of both beneficial and harmful mutations?

    <p>Beneficial and harmful mutations can both be caused by changes in the DNA sequence, including point mutations, reading frameshifts, and chromosome/block mutations</p> Signup and view all the answers

    What is the primary difference between a gametic mutation and a somatic mutation?

    <p>Gametic mutations can be passed on to future generations, while somatic mutations cannot</p> Signup and view all the answers

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