Biology 11th Edition by Cecie Starr ,Ralph Taggart

تمرين 11

In some cases, the termination of transcription of prokaryotic DNA depends on the structure of the newly forming RNA transcript. The terminal end of an mRNA transcript often folds back tightly on itself and makes a hairpin-looped structure, like the one shown at right.
Why do you suppose that a "stem-loop" structure such as this stops transcription of prokaryotic DNA when the RNA polymerases reach it