In an experimental situation, a student researcher inserts an mrna molecule into a eukaryotic cell after he has removed its 5' cap and poly-a tail. which of the following would you expect him to find? a. the molecule is digested by restriction enzymes in the nucleus. b. the molecule attaches to a ribosome and is translated, but more slowly. c. the cell recognizes the absence of the tail and polyadenylates the mrna. d. the molecule is digested by exonucleases since it is no longer protected at the 5' end. e. the mrna could not exit the nucleus to be transcribed.