web.pdx.edu/~rueterj/bi445/notes/regulation3.htm

Simple Regulation of Gene Expression

Gene expression controls the amount of any particular enzyme. There are several simple mechanisms for gene expression that can help regulate metabolism.

Induction and de-repression:

Expressing a gene in the presence of a signal compound

example - the Lac Operon

Repression:

Turing the gene off in the presence of a signal compound

example - the Trp Operon