Question:
A polysistronic structural gene is regulated by a common promoter and regulatory genes in bacteria called:
A polysistronic structural gene is regulated by a common promoter and regulatory genes in bacteria called:
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Operon is a functional unit of DNA in prokaryotes where multiple genes are controlled by a single promoter.
Updated On: Jun 19, 2026
- Recons
- Operon
- Position
- Muton
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The Correct Option is B
Solution and Explanation
Step 1: Understand the concept.
In bacteria, genes that code for proteins involved in a single metabolic pathway are often grouped together and regulated as a single unit. This functional unit is called an operon.
Step 2: Analyze the statement.
The question describes a polysistronic structural gene system regulated by a common promoter along with regulatory genes. This is a defining feature of the operon model in prokaryotes.
Step 3: Evaluate options.
- Recons: Not a genetic regulatory unit.
- Operon: Correct unit of gene regulation in bacteria.
- Position: Not related to gene regulation.
- Muton: Smallest unit of mutation, unrelated to regulation.
Step 4: Conclusion.
Therefore, the correct answer is Operon.
In bacteria, genes that code for proteins involved in a single metabolic pathway are often grouped together and regulated as a single unit. This functional unit is called an operon.
Step 2: Analyze the statement.
The question describes a polysistronic structural gene system regulated by a common promoter along with regulatory genes. This is a defining feature of the operon model in prokaryotes.
Step 3: Evaluate options.
- Recons: Not a genetic regulatory unit.
- Operon: Correct unit of gene regulation in bacteria.
- Position: Not related to gene regulation.
- Muton: Smallest unit of mutation, unrelated to regulation.
Step 4: Conclusion.
Therefore, the correct answer is Operon.
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