Which of the following is not true? Splicing of mRNAs...
a) involves assembly of snRNPs to form a spliceosome
b) requires that the spliceosome recognizes exon/ intron boundaries in DNA
c) is facilitated by proteins that associate with the CTD of RNA polymerase II
d) can generate differentially spliced mRNAs from one gene
e) involves conserved nucleotide sequences that are encoded in DNA