Final answer:
The new piece of mRNA is transcribed in the 5' to 3' direction.
Step-by-step explanation:
The new piece of mRNA is transcribed in the 5' to 3' direction. During transcription, RNA polymerase reads the template DNA strand in the 3' to 5' direction and synthesizes the mRNA in the opposite direction. The mRNA carries the genetic information from the nucleus to the ribosomes, where it is used as a template for protein synthesis (translation).