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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?

To regulate the expression of beta-galactosidase Signup and view all the answers

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

Polycistronic Signup and view all the answers

Which level of gene regulation is most common in prokaryotes?

Transcriptional Signup and view all the answers

In eukaryotes, how is gene expression regulated?

At multiple levels Signup and view all the answers

What is the default state of gene expression in prokaryotes?

On, like a light switch Signup and view all the answers

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

Prokaryotes have a single regulatory protein, while eukaryotes have multiple regulatory proteins Signup and view all the answers

What is the function of repressors in gene regulation?

Turn transcription off Signup and view all the answers