A transcription unit encodes a a promoter terminator RNAcodi

A transcription unit encodes a:

a. promoter

terminator

RNA-coding region.

promoter, terminator, and RNA-coding region.

None of the answers is correct. The transcription unit is part of the mRNA only.

Solution

Answer: c. RNA-coding region.

Explanation:

The segment of DNA taking part in the transcription is called the transcription unit and it encodes for at least one gene. Transcription unit consists of mainly the promoter, the structural gene and the terminator. A simple transcription unit RNA transcript is processed to yield a single mRNA encoding a single protein. Complex transcription units, which are more common, encode an RNA transcript that is processed to form different monocistronic mRNAs each encoding a different protein.