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  • (a) What is operon (b) Explain how a polycistronic structural gene is regulated by a common promoter and a combination of regulatory genes in

(a) What is operon?

(b) Explain how a polycistronic structural gene is regulated by a common promoter and a combination of regulatory genes in lac - operon.

 

 

 

 
 
 
 
 

Answers (1)

(a)

An operon  is polycistronic structural gene which is regulated by common promoter and regulated by common promoter and regulator gene transciptionally regulated system in which polycisctronic structure gene is controlled by common promoter and regulator gene.

(b)

  1. Lac operon consist of one regulatory gene which codes for repressor protein, Promoter (P) and operator (O) are adjacent to gene i.
  2. Structural gene z,y,a code for enzymes (a - galactosidase, permease and transcetylase respectively).
  3. The regulator gene; synthesis the repressor protein call the time. in absence of inducer the repressor proyein binds to the operator region of operon, prevents transcription (by RNA polymerase).
  4. The repressor is inactivated in presence of an inducer (lactose) that binds with it this allows RNA polymerase access to promoter and transcription proceeds.

 

Posted by

Priyanka Kumari

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