Which of the Following Structures is Not Part of an Operon

Question

Which of the following structures is not part of an operon?
A)regulator gene
B)promoter
C)operator
D)structural gene
E)All of these are part of an operon.

Accepted Answer

An operon is a group of genes that are regulated together. It consists of a promoter, an operator, and one or more structural genes. The regulator gene is not part of an operon.