AP Bio - Chapter 13.2-13.3 (Regulation of Gene Expression)

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

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

what is an operon?

• a part of a ribsome
• a part of a Rna
• a unit made up of linked genes that code for proteins needed to do a specific task
• needed for dna replication

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

• promoter
• repressor
• operator
• gene

The lac operon genes only become expressed if:

• lactose binds to the repressor
• glucose binds to the repressor
• lactose binds to the operator
• the repressor binds to the operator

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 type of operon is the trp (tryptophan) operon?

• inducible
• repressible
• positive control
• promoible