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Question

Choose the correct answer from the alternatives given :
The RNA polymerase holoenzyme transcribes

A
The promoter, structural gene and the terminator region
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B
The promoter and the terminator region
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C
The structural gene and the terminator region
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D
The structural gene only
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Solution

The correct option is D The structural gene only
Transcription involves 3 seperate processes: initiation, elongation, termination. Initiation begins when the RNA polymerase binds to the promoter which serves only as a target site for binding of the RNA polymerase and is not transcribed. Each gene contains a specific promoter region for guiding the begining of transcription. This is followed by region of gene (structural gene) that is transcribed and ends with a terminator that stops transcription.
So, the correct answer is 'The structural gene only'.

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BIOLOGY
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