Which of the following reflects the order of operon elements, assuming transcription is occurring from left to right?
A) Operator, promoter, structural genes
B) Operator, structural genes, promoter
C) Promoter, operator, structural genes
D) Promoter, structural genes, operator
E) Structural genes, promoter, operator

Question

Quizplus · Accepted Answer

The general order of operon elements from left to right is promoter, operator, and then the structural genes. This is because the promoter is the DNA sequence where RNA polymerase binds and initiates transcription, followed by the operator, which is a regulatory region that controls the access of RNA polymerase to the structural genes. Finally, the structural genes contain the actual coding sequence for the proteins or RNA molecules that are involved in the biological process controlled by the operon.

Which of the Following Reflects the Order of Operon Elements