Lect. 7.
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Questions and Answers

Which enzyme cleaves double-stranded siRNA into smaller fragments?

  • Dicer (correct)
  • Intron
  • Argonaut
  • Ribonuclease
  • What is the function of the RISC complex in RNA interference?

  • Activating gene expression
  • Degradation of siRNA
  • Pairing with mRNA to inhibit translation or cleaving of the mRNA (correct)
  • Promoting mRNA stability
  • In RNA interference, what is used for gene knockdown in research?

  • Single-stranded RNA
  • Double-stranded RNA (correct)
  • Non-coding RNA
  • Micro RNA
  • What is the role of the antisense RNA in the formation of the RISC complex?

    <p>Forms RISC complex with Argonaut to pair with mRNA (C)</p> Signup and view all the answers

    What is the role of tryptophan in the regulation of the trp operon?

    <p>Tryptophan acts as a co-repressor, binding to the inactive repressor and making it active to prevent transcription of the trp operon genes (D)</p> Signup and view all the answers

    What is the consequence of an excess of tryptophan in the environment or in the cell?

    <p>Transcription of the trp operon genes is limited, saving the cell energy and resources (C)</p> Signup and view all the answers

    True or false: Tryptophan acts as a co-repressor in the regulation of the trp operon by preventing transcription of the structural genes.

    <p>True (A)</p> Signup and view all the answers

    True or false: When there is an excess of tryptophan in the environment, the trp operon is repressed, leading to limited transcription of the structural genes involved in tryptophan synthesis.

    <p>True (A)</p> Signup and view all the answers

    RNA silencing limits the transcript level by activating a sequence-specific RNA degradation process.

    <p>True (A)</p> Signup and view all the answers

    In the Lac operon, LacY encodes for transacetylase.

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

    TCS is a type of regulatory system used by bacteria to detect chemical and/or physical signals found in its environment.

    <p>True (A)</p> Signup and view all the answers

    SiRNA is a type of RNA interference that involves short exogenous interfering dsRNA.

    <p>True (A)</p> Signup and view all the answers

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