Question

Explain the structure of transcription unit with diagram.

Hint:

By convention, the sequence of the "coding strand" (5' to 3') is used to describe the locations in a transcription unit, even though it is the "template strand" (3' to 5') that is actually transcribed.

Answer 1

Step 1: Promoter: Located towards the 5'-end (upstream) of the coding strand. It provides the binding site for RNA polymerase.
Step 2: Structural Gene: The region between the promoter and terminator where the actual transcription of DNA into RNA takes place.
Step 3: Terminator: Located towards the 3'-end (downstream) of the coding strand. It defines the end of the process of transcription.