Control of Gene Expression: Repressible Genes
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Questions and Answers

What happens to a repressible gene when a regulatory chemical is added?

  • It is switched off (correct)
  • It becomes unstable
  • It remains unchanged
  • It is switched on

How is a repressible gene regulated?

  • By reducing translation efficiency
  • By addition of a regulatory chemical (correct)
  • By increasing transcription factors
  • By decreasing mRNA stability

Which term best describes a gene that can be turned off by a specific chemical?

  • Activatable gene
  • Promoter gene
  • Inducible gene
  • Repressible gene (correct)

What effect does the regulatory chemical have on a repressible gene?

<p>Switches it off (A)</p> Signup and view all the answers

In the context of gene regulation, what does 'repressible' mean?

<p>Can be turned off (D)</p> Signup and view all the answers

What type of gene is repressible?

<p>Gene that is turned off in the presence of a corepressor (C)</p> Signup and view all the answers

In the context of gene expression, what do regulatory switches control?

<p>The rate of transcription (B)</p> Signup and view all the answers

Which term describes a gene that is only active in the presence of a specific inducer?

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

What is the role of a promoter in gene expression vectors?

<p>It regulates transcription initiation (C)</p> Signup and view all the answers

Which term best describes a gene that is always actively transcribed, regardless of external conditions?

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

What happens to the transcription of a repressible gene when a chemical is added to the growth medium?

<p>It is switched on (B)</p> Signup and view all the answers

Which type of gene regulation involves promoters indirectly?

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

What effect does addition of a chemical have on the transcription of an inducible gene?

<p>It is switched on (B)</p> Signup and view all the answers

How does a repressible gene behave in the absence of the inducer chemical?

<p>Transcription is active (C)</p> Signup and view all the answers

What aspect of gene regulation is specifically mentioned to involve promoter 2 indirectly?

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

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