Gene regulation

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

• regulator
• repressor
• activator
• corepressor

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In eukaryotes, proteins that help the RNA polymerase bind to the regulatory region for transcription are called ____________.

• transcription factors
• topoisomerase
• regulatory genes
• activators

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

What structure of this molecule binds with the mRNA molecule?

• Amino Acid
• tRNA
• Anticodon
• Codon

What is the name of the stretch of DNA where RNA polymerase binds?

• operator

• promoter

• enhancer

• regulatory gene

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

• promoter

• enhancer

• operator

• gene

An operon consists of all the the following EXCEPT

• operator
• promoter
• regulatory gene
• genes of the operon

A small molecule that binds to a repressor and makes it active

• repressor
• regulator
• activator
• corepressor

A small molecule that binds to the repressor and makes it inactive is

• corepressor
• inducer
• promoter
• operator

The tryptophan operon is

• permanently turned on.

• turned on when tryptophan is present in the growth medium.

• turned off only when glucose is present in the growth medium.

• turned off when tryptophan is added to the growth medium.