Which of the Following is Not a Constituent of an Operon

Question

Which of the following is not a constituent of an operon?
A) Operator
B) Structural genes
C) Promoter
D) Intron
E) All of these are correct.

Accepted Answer

Introns are not part of operons. Operons are a group of genes that are controlled by a single promoter and operator and are transcribed into a single mRNA molecule. Introns are non-coding sequences found within eukaryotic genes that are removed by splicing before the final mRNA molecule is formed.