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Which one of the following is not a part of a transcription unit in DNA?

1. A promoter
2. The structural gene
3. A terminator
4. An enhancer

Correct answer: An enhancer

Solution

A transcription unit consists of the promoter, the structural gene, and the terminator. An enhancer is a regulatory DNA sequence that can increase transcription, but it is not part of the transcription unit itself.

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