Question

In Escherichia coli, lac operon is induced by
(a) lactose
(b) promoter gene
(c) b -galactosidase
(d) I-gene

Answer 1

Answer:

the required answer is (b) promoter Gene..

Answer 2

Lac Operon

Explanation:

   (b) In Escherichia coli, lac operon is induced by promoter gene.

1. The qualities lacZ, lacY and lacA are interpreted from a solitary advertiser (P) that delivers a solitary mRNA from which the three proteins are deciphered.
2. The operon is controlled by Lac repressor, the result of the lacI quality, which is deciphered from its own advertiser (PI).  
3. The lac operon of E. coli contains qualities associated with lactose digestion.
4. It's communicated just when lactose is available and glucose is missing.
5. Two controllers turn the operon "on" and "off" because of lactose and glucose levels the lac repressor and catabolite activator protein (CAP).