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Gene regulation governing lactose operon...

Gene regulation governing lactose operon of E. coli that involves the lac I gene product is

A

Negative and repressible because repressor protein prevents transcription

B

Feedback inhibition because excess of `beta`-galactosidase can switch off transcription

C

Positive and inducible because it can be induced lactose

D

Negative and inducible because repressor protein prevents transcription

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The correct Answer is:
A
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The sequence of genes in lac operon in E. coli is :

What is true of E. coli with lac -z gene ?

The lac operon consists of a regulation gene and three structural gene. The lactose acts as inducer. In the presence of an Inducer such as lactose, the repressor is in inactivated during the interaction. This allows RNA polymerase access to the promoter and transcription proceeds. The repressor is synthesized which in turn binds with the operator region of the operon and prevents RNA polymerase from transcribing the operon. Which of the following statement is true in reference to the lac operon process in E.coli? (i) Galactosidase is the only enzyme produced in large quantities when lac operon is turned on (ii) The messenger RNA in lac operon is a polycistronic mRNA

The promoter gene in lac operon :

(a) Explain with the help of schematic representation the lac operon of E. coli. (b) Mention the role of lactose in this operon.

Enlist the genes in Lac operon

Given above is the schematic representation of lac operon of E.coli. Explain the functioning of this operon when lactose is provided in the growth medium of the bacteria.

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