Match the definition below with its term from the list above consensus nucleotide sequence RNA splicing DNA supercoiling rRNA gene general transcription factor rRNA (ribosomal RNA) exon snoRNA (small nucleolar RNA) sn RNA (small nuclear RNA) exosome intron mRNA (messenger RNA) nuclear pore complex promoter RNA polymerase RNA polymerase holoenzyme spliceosome TATA box terminator transcription trans-splicing a. RNA molecule that specifies the amino acid sequence of a protein. b. A large protein complex that contains multiple 3' to 5' RNA exonucleases which degrade improperly processed mRNAs, introns, and other RNA debris retained in the nucleus. c. Nucleotide sequence in DNA to which RNA polymerase binds to begin transcription. d. Small RNA molecules that are complexed with proteins to form the ribonucleoprotein particles involved in RNA splicing. e. Any one of a number of specific RNA molecules that form part of the structure of the macromolecular complex responsible for synthesis of proteins; often distinguished by their sedimentation coefficient, such as 28S or 5S. f. Large multiprotein structure forming a channel through the nuclear envelope that allows selected molecules to move between nucleus and cytoplasm. g. Process in which intron sequences are excised from RNA transcripts in the nucleus during the formation of messenger and other RNAs. h. Signal in bacterial DNA that halts transcription.