Activators bind to regulatory sequences in ________ and to ________ polymerase.

Both repressible and inducible operons control gene expression at the level of __________.

In the lac operon, the repressor inhibits transcription whena. the repressor is bound to the inducer.b. the repressor is not bound to the inducer.c. the repressor is bound to glucose.d. the repressor is not bound to the operator.

In the lac operon, the repressor inhibits transcription whena. the repressor is bound to the inducer.b. the repressor is not bound to the inducer.c. the repressor is bound to glucose.d. the repressor is not bound to the operator.

Activators bind to regulatory sequences in ________ and to ________ polymerase.

A regulon is a set of genes controlled bya. one type of regulator of transcription.b. two or more different alternative sigma proteins.c. many different types of promoters.d. glucose.

A regulon is a set of genes controlled bya. one type of regulator of transcription.b. two or more different alternative sigma proteins.c. many different types of promoters.d. glucose.

What would occur if the repressor of an inducible operon were mutated so it could not bind the operator?a. irreversible binding of the repressor to the promoterb. reduced transcription of the operon's genesc. buildup of a substrate for the pathway controlled by the operond. continuous transcription of the operon's genes

Explain why it makes sense for the lexA regulatory gene of the SOS regulon to be expressed constitutively.