All of the following are part of an operon except

A an enhancer

B structural genes

C an operator

D a promoter

The answer is A.

Solution

Operons have promoter, operator and structural genes; enhancers are eukaryotic.

Enhancer sequences are present in eukaryotes. The operon concept is for prokaryotes, so an enhancer is not part of an operon.

Concept operon-components

3 questions from this chapter have appeared across 3 exam years.