Operon

What is the purpose of an operon in bacteria?

• Produce proteins

• Control gene expression

• Regulate cell division

• Synthesize lipids

Which of the following is NOT a component of an operon?

• Promoter

• Repressor

• Ribosome

• Operator

In a lac Operon, what molecule binds to the repressor to activate gene transcription?

• A) Glucose

• B) Tryptophan

• C) Lactose

• D) Sucrose

Which operon is designed to deal with the absence of tryptophan in bacteria?

• Lac Operon

• Trp Operon

• Gal Operon

• Mal Operon

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

• promoter

• repressor

• operator

• gene

Which of the following statements regarding the trp operon is true?

• The operator region produces the mRNA that codes for the repressor.

• The regulatory gene is not transcribed in the presence of the repressor.

• Repressor proteins are inactivated by the presence of the repressor.

• The trp operon is always activated unless deactivated by a repressor

What is 2 in the diagram?

• RNA polymerase

• Inducer

• Repressor

• Operator

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

• lactose is absent in the cell

• galactose is present in the cell

• lactose is present in the cell

• glucose is absent in the cell

What is 5 in the diagram?

• RNA polymerase

• Inducer

• Repressor

• Operator

Tags

NGSS.HS-LS1-1

The trp operon in E. Coli is responsible for making 5 polypeptides involved in the tryptophan synthesis pathway. When tryptophan is present, it combines with the repressor protein to block the operator. What type of operon is trp?

• Repressible

• Inducible