Gene Expression Regulation

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Questions and Answers

What is the main reason why gene expression regulation is necessary in cells?

  • Cells have the same proteins
  • Cells have different promoters
  • Cells have all the DNA but not all genes are expressed (correct)
  • Cells have different types of DNA

What is the function of repressor proteins in gene expression regulation?

  • To degrade mRNA transcripts
  • To enhance the interaction of RNA polymerase and a promoter
  • To bind to the DNA to stop RNA polymerase from proceeding (correct)
  • To transcribe genes more efficiently

What is the lac operon an example of in prokaryotic cells?

  • Gene silencing
  • Gene expression regulation (correct)
  • Gene duplication
  • Gene mutation

What is the function of an operator in an operon?

<p>A region where regulatory proteins bind (D)</p> Signup and view all the answers

What type of protein regulates gene expression by binding to non-coding sequences on DNA?

<p>Repressor protein (D)</p> Signup and view all the answers

What is the lac operon composed of?

<p>A promoter, an operator, and three genes (B)</p> Signup and view all the answers

What is the primary reason why the lac operon is necessary in E. coli?

<p>To allow the bacteria to digest lactose only when it is present in the gut (D)</p> Signup and view all the answers

What is the role of the repressor protein in the lac operon?

<p>To inhibit the transcription of the lactase gene (A)</p> Signup and view all the answers

What type of gene is the regulatory gene that codes for the repressor protein in the lac operon?

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

What happens to the repressor protein when lactose is present in the bacterial cell?

<p>It is inactivated by the lactose molecule (A)</p> Signup and view all the answers

What is the role of the lac operon in protein synthesis?

<p>To control the transcription of the lactase gene (B)</p> Signup and view all the answers

What is the characteristic of a stem cell?

<p>It is a cell that can become any type of cell (C)</p> Signup and view all the answers

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