Home
Class 12
BIOLOGY
The lac operon consists of a regulation ...

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.
Identify the correct sequence of the structural genes in the lac operon.

A

lacA-lacZ-lacY

B

lacZ-lacA-lacY

C

lacZ-lacY-lacA

D

lacA-lacY-lacz

Text Solution

AI Generated Solution

The correct Answer is:
To identify the correct sequence of the structural genes in the lac operon, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Components of the Lac Operon**: - The lac operon consists of a regulatory gene (I), an operator (O), and three structural genes (Z, Y, and A). - The structural genes are responsible for producing proteins that are involved in the metabolism of lactose. 2. **Identify the Function of Each Structural Gene**: - **Z gene**: Codes for beta-galactosidase, which breaks down lactose into glucose and galactose. - **Y gene**: Codes for permease, which facilitates the entry of lactose into the bacterial cell. - **A gene**: Codes for transacetylase, which is involved in the metabolism of lactose. 3. **Determine the Sequence of Structural Genes**: - The correct order of the structural genes in the lac operon is Z, Y, A. - This sequence is crucial for the operon's function, as it reflects the order in which the proteins are produced. 4. **Conclusion**: - The correct sequence of the structural genes in the lac operon is **Z, Y, A**.
To identify the correct sequence of the structural genes in the lac operon, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Components of the Lac Operon**: - The lac operon consists of a regulatory gene (I), an operator (O), and three structural genes (Z, Y, and A). - The structural genes are responsible for producing proteins that are involved in the metabolism of lactose. ...
Promotional Banner

Similar Questions

Explore conceptually related problems

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. What provides binding site to RNA polymerase?

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 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. The lac operon of E. coli contains genes involved in lactose metabolism. It's expressed only when lactose is _____ (1)and glucose is _____(2).

The sequence of structural genes in lac operon is

Sequence of structural genes of lac operon is

The promoter gene in lac operon :

Enlist the genes in Lac operon

In lac operon if mutation occurs in the middle gene of the 'structural gene' then

During expression of an operon , RNA polymerase binds to

In lac operon, lactose acts are