The blob operon produces enzymes that convert compound A int

The blob operon produces enzymes that convert compound A into compound B. The operon in controlled by a regulatory gene S. Normally, the enzymes are synthesized only in the absence of compound B. If gene S is mutated, the enzymes are synthesized in the presence and in the absence of compound B. This operon is? Inducible and under negative control Repressible and under negative control Repressible and under positive control Inducible and under positive control

Solution

Ans: Repressible and under positive control

The blob operon produces enzymes that convert compound A into compound B. The operon is controlled by regulatory gene S. NOrmally the enzymes encoded by the operon are synthesized only in the absence of compound B. If gene S is mutated, the enzymes are synthesized in the both presence AND absence of compound B. The compound B acts as corepresser.

The blob operon produces enzymes that convert compound A into compound B. The operon is controlled by regulatory gene S. NOrmally the enzymes encoded by the operon are synthesized only in the absence of compound B. If gene S is mutated, the enzymes are synthesized in the both presence AND absence of compound B. Gene S must encode: activatror and regulatory proteins