Gene Regulation

Most gene regulation happens at which step along the way?

• translation
• transcription
• signal transduction
• DNA replication

what does a promoter do?

• it allows a gene to be transcribed
• it creates a DNA segment
• it is another word for ribosomes
• it is another word for RNA

what does a promoter do?

• it allows a gene to be transcribed
• it creates a DNA segment
• it is another word for ribosomes
• it is another word for RNA

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

• regulator
• repressor
• activator
• corepressor

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 is the name given to part of a DNA molecule that codes for a protein?

• Glucose
• Chromosome
• Gene
• Phosphate

Tags

NGSS.HS-LS1-1

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

Which of the following statements regarding mRNA is correct?

• Exons are included in the protein sequence, while introns are left out
• Introns are included in the protein sequence, while exons are left out
• Exons and Introns can both be included or left out depending on the protein
• Exons and Introns are both part of the mRNA sequence, but only exons are part of the rRNA and tRNA

Tags

NGSS.HS-LS1-1

The lactose operon is likely to be transcribed when

• there is more glucose in the cell than lactose.

• the cyclic AMP levels are low.

• there is glucose but no lactose in the cell.

• the cyclic AMP and lactose levels are both high within the cell.

• the cAMP level is high and the lactose level is low.

How does active CAP induce expression of the genes of the lactose operon?

• It terminates production of repressor molecules.

• It degrades the substrate allolactose.

• It stimulates splicing of the encoded genes.

• It stimulates the binding of RNA polymerase to the promoter.