1. Structural gene is a gene coding a polypeptide.
2. A group of genes in prokaryotes that is regulated and expressed together is known as operon.
3. Besides the structural genes, an operon also include a promoter and operator.
4. Regulator is not included in an operon but it exists to regulate the genes.
5. There are two kinds of operons:
(i) inducible operons: Lactose operon
--> it is stimulated or induced when an inducer interacts with a regulatory protein
(ii) repressible operons: Tryptophan operon
--> its transcription id inhibited when a repressor binds allosterically to a regulatory protein.
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