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Which of the following is incorrect for ...

Which of the following is incorrect for operon concept?

A

The sequence of structural gene in lac operon is ZYA where Z gene codes for hydrolytiv enzyme

B

Allolactose turns it on by binding with repressor protein

C

It is an inducible operon and controls catabolic reactions

D

Operator gene receives RNA polymerase to switch it off

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the incorrect statement about the operon concept, we will analyze each option provided in the context of the lac operon. ### Step-by-Step Solution: 1. **Understand the Operon Concept**: - An operon is a segment of DNA that contains structural genes and regulatory elements. It consists of genes that code for proteins involved in a particular metabolic pathway. 2. **Identify the Components of the Lac Operon**: - The lac operon includes: - **I gene**: Codes for the repressor protein. - **P gene**: Promoter region where RNA polymerase binds. - **O gene**: Operator region where the repressor binds. - **Z, Y, A genes**: Structural genes that code for enzymes (Z for beta-galactosidase, Y for lactose permease, and A for transacetylase). 3. **Analyze Each Option**: - **Option 1**: "The sequence of structural gene in lac operon is ZyA." - This is correct because the order is indeed Z, Y, A. - **Option 2**: "Allolactose turns it on by binding with the repressor." - This is correct as allolactose binds to the repressor, inactivating it and allowing transcription. - **Option 3**: "It is an inducible operon." - This is also correct since the lac operon is induced by the presence of lactose or allolactose. - **Option 4**: "The operator gene receives RNA polymerase to switch it off." - This is incorrect. The operator does not bind RNA polymerase; instead, it binds the repressor protein. RNA polymerase binds to the promoter region. 4. **Conclusion**: - The incorrect statement is **Option 4**. The operator region does not receive RNA polymerase; it is the promoter region that binds RNA polymerase. ### Final Answer: The incorrect statement regarding the operon concept is **Option 4**: "The operator gene receives RNA polymerase to switch it off."
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