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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?

A region where regulatory proteins bind (D) Signup and view all the answers

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

Repressor protein (D) Signup and view all the answers

What is the lac operon composed of?

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

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

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

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

To inhibit the transcription of the lactase gene (A) Signup and view all the answers

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

Regulatory gene (D) Signup and view all the answers

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

It is inactivated by the lactose molecule (A) Signup and view all the answers

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

To control the transcription of the lactase gene (B) Signup and view all the answers

What is the characteristic of a stem cell?

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

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