RNA transcription
Sequential addition of ribonucleotides
occurs at the 3’ end of the
growing RNA chain,
so that growth occurs in the 5' 
3'
direction, as in DNA.
Note
that in this diagram, the process is depicted as proceeding
from right
to left., but still in the 5' 
3'
direction.
Figure © 2000
by
Griffiths et al. ;
text © 2024 by Steven M. Carr