If you were given a bacterial strain with a mutation in the promoter region of the trp operon the most likely effect would be
A)interference with RNA polymerase binding.
B)to block the repressor from binding.
C)derepression of the trp operon.
D)enabling the trp operon to be expressed in the absence of tryptophan.
E)lack of expression of just the first gene in the operon.

Question

Quizplus · Accepted Answer

Mutations in the promoter region of an operon typically affect the binding of RNA polymerase, which is necessary for the initiation of transcription. The promoter is the DNA sequence where RNA polymerase attaches to begin transcription, so alterations in this region can interfere with the enzyme's ability to bind and initiate the process.

If You Were Given a Bacterial Strain with a Mutation