Replication
the replication of paramyxoviruses follows a common theme. after attachment, the F protein fuses the viral envelope to the cell membrane, becoming part of it and releasing the nucleocapsid into the cell. the negative-sense genome cannot act as messenger RNA (mRNA), making it nercessary for the virus to carry its own RNA-dependent RNA polymerase. this polymerase produces sudgenomic-sized mRna transcripts, which are translated to polypeptides. these include a econd RNA polymerase, which copies the genome into full-length positive complementary strands that are, in turn, copied back into negative strands both