The three basic parts of an operon are the
A) promoter, the operator, and two or more structural genes.
B) promoter, the structural genes, and the termination codons.
C) promoter, the mRNA, and the termination codons.
D) structural genes, the mRNA, and the tRNAs.
E) None of the above

Question

Quizplus · Accepted Answer

The three basic parts of an operon are the promoter, the operator, and two or more structural genes. The promoter is the region of DNA where RNA polymerase binds and initiates transcription. The operator is a regulatory region of DNA located between the promoter and the structural genes, which controls the expression of the genes by acting as an on/off switch. The structural genes are the genes that are transcribed into mRNA and ultimately translated into proteins.

The Three Basic Parts of an Operon Are the