Lac operon

Front

What type of organisms have operons?

Back

Operons are found in prokaryotes.

Front

Are the binding of repressors to operators reversible?

Back

False

Front

What is the role of a repressor in the lac operon?

Back

A repressor is a protein that binds to the operator and blocks RNA polymerase.

Front

What is the source of the repressor protein in the lac operon?

Back

The repressor is the protein product of a regulatory gene.

Front

What serves as an inducer in the lac operon?

Back

Allolactose serves as an inducer.

Front

What happens to the lac operon when lactose is absent?

Back

Induction of the operon ceases when lactose is absent.

Front

What is the function of the operator in the lac operon?

Back

The operator is a segment of DNA that a repressor binds to, preventing transcription.

Front

What is the function of RNA polymerase in the lac operon?

Back

RNA polymerase transcribes the genes of the operon into mRNA.

Front

What is an inducer in the context of the lac operon?

Back

An inducer is a molecule that initiates gene expression by disabling the repressor.

Front

What is the relationship between lactose and allolactose in the lac operon?

Back

Lactose is converted to allolactose, which acts as an inducer.