1) The lac operon is an inducible operon, whereas the trp operon is a repressible operon.

2) Objective To clone and express Trp operon gene of E.

3) In this paper, the Monod lactose operon modelis described as a computer program by BASIC language.

4) Each operon may include more than one pentose - reducing enzyme encoding sequence.

5) Glucose blocks induction of the lac operon by utilizing a positive control mechanism.

6) In negative inducible operons, a regulatory repressor protein is normally bound to the operator and it prevents the transcription of the genes on the operon.

7) Consequently, if glucose is present in the medium, it is redundant to induce the lac operon.