Which of the following does not occur in prokaryotic eukaryotic gene expression, but does in eukaryotic gene expression? A) mRNA, tRNA, and rRNA are transcribed. B) RNA polymerase binds to the promoter. C) A poly-A tail is added to the 3′ end of an mRNA and a cap is added to the 5′ end. D) Transcription can begin as soon as translation has begun even a little. E) RNA polymerase requires a primer to elongate the molecule.