Question:
A cluster of genes under the control of a single promoter is called
A cluster of genes under the control of a single promoter is called
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Operon:
- Cluster of genes under one promoter.
- Promoter + Operator + Structural genes.
- Example: lac operon, trp operon.
- Cluster of genes under one promoter.
- Promoter + Operator + Structural genes.
- Example: lac operon, trp operon.
Updated On: Sep 1, 2026
- Operator
- Operon
- Oncogene
- ORF
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
This question tests knowledge of gene regulation in prokaryotes.
Step 2: Detailed Explanation:
An operon is a cluster of genes under the control of a single promoter.
It includes:
- Structural genes (coding sequences).
- Promoter (binding site for RNA polymerase).
- Operator (binding site for repressor).
Example: lac operon in E. coli.
Operator (A): The DNA sequence where the repressor binds.
Oncogene (C): A gene that can cause cancer.
ORF (D): Open Reading Frame (coding sequence).
Thus, a cluster of genes under a single promoter is an operon.
Step 3: Final Answer:
Thus, a cluster of genes under a single promoter is an operon, which corresponds to option (B).
[0.5cm]
This question tests knowledge of gene regulation in prokaryotes.
Step 2: Detailed Explanation:
An operon is a cluster of genes under the control of a single promoter.
It includes:
- Structural genes (coding sequences).
- Promoter (binding site for RNA polymerase).
- Operator (binding site for repressor).
Example: lac operon in E. coli.
Operator (A): The DNA sequence where the repressor binds.
Oncogene (C): A gene that can cause cancer.
ORF (D): Open Reading Frame (coding sequence).
Thus, a cluster of genes under a single promoter is an operon.
Step 3: Final Answer:
Thus, a cluster of genes under a single promoter is an operon, which corresponds to option (B).
[0.5cm]
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