What is the term for the sequence between a point of initiation and termination that may include multiple genes?

The term "transcription unit" accurately describes the sequence between a point of initiation and termination that may include multiple genes. A transcription unit is defined as the segment of DNA that is transcribed into an RNA molecule, encompassing not only the coding regions for one or more genes but also the necessary regulatory elements that facilitate transcription initiation and termination.

In the context of prokaryotic organisms, especially, transcription units can often contain multiple genes that are co-transcribed into a single mRNA molecule. This allows for the coordinated expression of functionally related genes, which can be beneficial for processes such as metabolic pathways.

Understanding what constitutes a transcription unit is essential as it highlights the organization of genetic information and the efficiency of gene expression in certain biological contexts. It serves as the fundamental concept linking the genetics of molecular biology with the functional outputs of gene expression processes.