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Question

Choose the odd one out with respect to the transcription unit.

A
Terminator
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B
Structural gene
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C
Promoter
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D
Operator
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Solution

The correct option is D Operator

Transcription unit (TU) is defined as the segment of DNA between the sites of initiation and termination of transcription by RNA polymerase. More than one gene may reside in a transcription unit. The transcription unit consists of three regions i.e., promoter, terminator and structural gene.

Promoter: It is a region of the DNA to which the RNA polymerase binds and initiates transcription.

Terminator: It is a region of the DNA to which the RNA polymerase binds and stops transcription.

Structural gene: A structural gene is a segement of DNA that codes for any RNA or protein product other than a regulatory factor.

Operator gene: It is a segment of DNA that interacts with a specific repressor protein to regulate the expression of subsequent gene or gene set.

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