86. Which statement about the transcription in eukaryotes is TRUE? (A) Protein synthesis can begin while DNA replication is still proceeding. (B) Transcription occurs in the nucleus. (C) Capping and splicing reactions proceed in the cytoplasm. (D) The mature mRNA contains both introns and exons. (E) A poly-A tail is attached to the RNA transcript after it is transported to the cytoplasm.