A fictional bacterial operon is responsible for the production of the biosynthet

Question

A fictional bacterial operon is responsible for the production of the biosynthetic enzymes needed to make the theoretical amino add Tisophane (Tis). In the wild-type condition, when Tis is present, no enzymes are made. In the absence ot Tis the enzymes are made. The operon is regulated by a separate gene. R. deletion of which causes loss of enzyme production, regardless of whether Tis is present A second class of regulatory mutations has been identified and these map to a region (the RB site) near the promoter of the Tis operon; these so-called RB mutations also block production of the enzymes, regardless of the availability ot Tis.

Explanation / Answer

a. this operon is under positive control as due to deletion of R gene there is swittching off of operon.

In the case of positive control, the genes are expressed only when an active regulator protein, e.g. an activator, is present. Thus the operon will be turned off when the positive regulatory protein is absent or inactivated.

b. the model will be like lac operon.

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