A gene operon consists of
A) a transcribed gene only.
B) a promoter only.
C) a regulatory gene only.
D) transcribed genes, an operator, and a promoter.

Question

Quizplus · Accepted Answer

A gene operon consists of multiple genes that are transcribed together as a single mRNA molecule, along with an operator and promoter region that regulates their expression. The operator is a DNA sequence that can bind a repressor protein, which can block transcription of the operon, while the promoter is the site where RNA polymerase binds to begin transcription. Therefore, option D is the correct answer as it includes all the necessary components of a gene operon.

A Gene Operon Consists of