14.3 Gene Regulation and Expression

Most gene regulation happens at which step along the way?

• translation
• transcription
• signal transduction
• DNA replication

A protein that binds to the operator and blocks the RNA polymerase

• regulator
• repressor
• activator
• corepressor

What does the lactose do to the Operon? 

• Blocks transcription because of the energy it provides
• Allows the repressor to be unbind from the Operator.
  
• The lactose binds the lactose and stops transcription
• Allows for the transcription to speed

What is the role of operons in prokaryote gene expression?

• It makes the genes prokaryotes be turned on
• It accounts for the regulation of gene activity in response to the needs of the cells
• To make DNA for the gene
• To make the gene turn of and off

The "on/off" switch for an operon is called the

• promoter
• repressor
• operator
• gene

In the lac operon model the genes within the operon will be expressed if:

• lactose is absent in the cell
• glucose is present in the cell
• lactose is present in the cell

What does the lactose do to the Operon?

• Blocks transcription because of the energy it provides

• Allows the repressor to unbind from the Operator.

• The lactose binds the lactose and stops transcription

• Allows for the transcription to speed

What eukaryotic gene control is being represented in the image?

• Transcriptional control

• Processing control

• mRNA stability control

• Translational control

• Post translational control

What is a feature of transcription?

• Both strands of a DNA molecule act as a template for mRNA.

• Nucleoside triphosphates become nucleotides by losing three phosphates.

• RNA polymerase binds to the promoter region.

• The sense strand acts as a template for mRNA.

What is the primary function of transcription factors?

• Mediate the binding of RNA Polymerase to the Promoter.

• Mediate the binding of the Ribosome to mRNA.

• Help mRNA find its way to the ribosome.

• Transcribe the DNA template into mRNA.