Question

during the actual production of proteins in a cell, what might happen to a strand of rna before it leaves the nucleus

Answer 1

splicing of hnrna occurs ( processing) to form the mrna before leaving the nucleus

( exons are removed)

Answer 2

The process of protein synthesis takes place outside the cell, in a special organelle called Ribosome. They are also called protein factory. Before the protein synthesis starts, the RNA is released from the cytoplasm.  

RNA is synthesized by a process called transcription. RNA polymerase enzyme use DNA strand to make a RNA strand which later on is translated into protein, inside the ribosome.