Eukaryotic/Prokaryotic Gene Regulation Quiz

What is the first level of organization or packing of DNA in the nucleus?

• Binding of DNA to RNA polymerase

• Folding of DNA into chromosomes

• Winding of DNA strands around histone proteins

• Attachment of DNA to the cell membrane

What is required for the transcription of genes in eukaryotes?

• DNA polymerase

• Helicase

• RNA polymerase and transcription factors

• DNA ligase

What is the purpose of the promoter region?

• To bind transcription factors that control the initiation of transcription

• To replicate the DNA

• To terminate transcription

• To splice RNA

What are enhancers?

• Regions that decrease transcription

• Signals that terminate transcription

• Proteins that degrade RNA

• Regions that help increase or enhance transcription

What is the role of transcriptional repressors?

• To splice introns from RNA

• To block transcription

• To enhance the binding of RNA polymerase

• To facilitate transcription initiation

Which of the following describes an operon that is inactive and becomes activated by a molecule binding to the repressor?

• inducible operon

• repressible operon

Which of the following describes an operon that is active and becomes inactivated by a molecule binding to the repressor?

• inducible operon

• repressible operon

The lac operon is an example of an inducible operon. Which of the following describes the process that occurs when lactose is present?

• The lactose binds to the repressor which inactivates it and the repressor binds to the operator to turn translation on.

• The lactose binds to the repressor which activates it and the repressor releases from the operator to turn translation on.

• The lactose binds to the repressor which inactivates it and the repressor releases from the operator to turn translation on.

• The lactose binds to the repressor which activates it and the repressor binds to the operator to turn translation on.

The trp operon is an example of an repressible operon. Which of the following describes the process that occurs when tryptophan is present?

• The tryptophan binds to the repressor which inactivates it and the repressor binds to the operator to turn translation off.

• The tryptophan binds to the repressor which activates it and the repressor releases from the operator to turn translation off.

• The tryptophan binds to the repressor which inactivates it and the repressor releases from the operator to turn translation off.

• The tryptophan binds to the repressor which activates it and the repressor binds to the operator to turn translation off.

In the lac operon, the allolactose binds to the repressor. Which of the following is the term used to describe this molecule?

• inducer

• corepressor

• enhancer

• CAP