select the correct answer. what is the determining factor for the transcription of structural genes of the…

select the correct answer. what is the determining factor for the transcription of structural genes of the trp operon? a. the quantity of trp repressor protein made by the regulatory gene trpr b. the ability of rna polymerase to bind to the promoter region c. the availability of tryptophan in the environment d. the location of a regulatory gene with reference to the other regions of the operon e. the activity of the other operons present in bacteria

select the correct answer. what is the determining factor for the transcription of structural genes of the trp operon? a. the quantity of trp repressor protein made by the regulatory gene trpr b. the ability of rna polymerase to bind to the promoter region c. the availability of tryptophan in the environment d. the location of a regulatory gene with reference to the other regions of the operon e. the activity of the other operons present in bacteria

Answer

Answer:

C. the availability of tryptophan in the environment

Brief Explanations:

The trp operon is a repressible operon. When tryptophan is abundant in the environment, it binds to the trp - repressor protein, activating it. The activated repressor then binds to the operator region, preventing RNA - polymerase from transcribing the structural genes. When tryptophan is scarce, the repressor is inactive and transcription can occur. So the availability of tryptophan determines transcription.