What is the relationship between operons and transcription units?

The transcription of genes in a single mRNA is known as operon and they often identified by the presence of promoters and terminators. Thus, there are several structural genes that are present in operon and they arranged under a common promoter, regulated by common operator. However, the structural gene that lies a promoter sequence provides a site for RNA polymerase to bind and initiate transcription. 

halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).

c

explanation: