The Regulation Of Gene Expression

10 Questions

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Regulation Quizzes & Trivia

The regulation of gene expression--especially the lac operon of E. Coli.


Questions and Answers
  • 1. 
    The cluster of genes important in lactose metabolism in E. coli, along with the controlling DNA elements for these genes are known by the very brief acronym:
    • A. 

      Lac operon

    • B. 

      Lactose regulating gene and their control elements

    • C. 

      Genes that regulate the breakdown of the disaccharide lactose plus the regulatory sequences near them

    • D. 

      The regulator gene, CAP-binding site, promoter, operator, 5' UTR coding region, ß-galactosidase gene, galactoside permease gene, and transacetylase gene

  • 2. 
    In an E. coli culture growing in medium with lactose, the lac operon is on because ______ cannot bind to a DNA site adjacent to the promoter.
  • 3. 
    In the lac operon of E. coli, repressor protein binds to the ________.
  • 4. 
    When lactose in an E. coli culture, allolactose binds to the _______ .
  • 5. 
    When _________ is bound to repressor protein, repressor protein cannot bind to the operator.
  • 6. 
    The lac operon of E. coli is transcribed when:
    • A. 

      Lactose is present.

    • B. 

      Repressor protein is bound to the operator.

    • C. 

      Allolactose binds to the promoter.

    • D. 

      All of the above.

  • 7. 
    The site on the DNA where a specific protein binds that results in RNA polymerase binding to the promoter is called the _________.
  • 8. 
    A (an) ________ is a small RNA molecule that is part of a RISC and binds precisely to an mRNA and results in its cleavage.
  • 9. 
    A (an) ________ is a small RNA molecule that is part of a RISC and binds imprecisely to an mRNA and turns off its translation.
  • 10. 
    When __________ occurs, a gene's pre-mRNA can result in the synthesis of two different polypeptides.