Lac Operon Quiz

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Questions and Answers

Which of the following is required for lac repressor to be made?

  • Functional promoter and lacI gene
  • Functional operator and lacZ coding region
  • Functional promoter and lacZ coding region
  • Functional promoter, lacZ coding region, and operator (correct)

What happens to the lacZ gene expression when there is no functional promoter?

  • It decreases (correct)
  • It increases
  • It remains the same
  • It is not affected

Which of the following is true about the lac operator and lac repressor?

  • They both bind to the promoter
  • They are required for lactase production
  • They both regulate the expression of beta-galactosidase (correct)
  • They are mutations in the lac operon

What is the function of regulatory proteins in the lac operon?

<p>To regulate the expression of beta-galactosidase (D)</p> Signup and view all the answers

What is the term for a situation where multiple proteins are encoded on a single mRNA molecule?

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

Which level of gene regulation is most common in prokaryotes?

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

In eukaryotes, how is gene expression regulated?

<p>At multiple levels (C)</p> Signup and view all the answers

What is the default state of gene expression in prokaryotes?

<p>On, like a light switch (D)</p> Signup and view all the answers

How do regulatory proteins in prokaryotes and eukaryotes differ in complexity?

<p>Prokaryotes have a single regulatory protein, while eukaryotes have multiple regulatory proteins (A)</p> Signup and view all the answers

What is the function of repressors in gene regulation?

<p>Turn transcription off (A)</p> Signup and view all the answers

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