Polyadenylation Signal Sequence: A specific sequence in eukaryotic genes that signals where an enzyme should add a string of adenine nucleotides (poly-A tail) at the end of pre-mRNA molecules during processing.
Rho-dependent termination: A type of termination in bacteria where Rho protein recognizes certain signals and causes polyermase to detach from the template strand ending transcription.
Rho-independent termination: Also known as intrinsic termination, is another method used by prokaryotes which doesn't require any additional factors except for RNAP itself.