Processing of a Primary MRNA Transcript in a Eukaryotic Cell

Multiple Choice

Processing of a primary mRNA transcript in a eukaryotic cell does not normally involve:

A) attachment of a long poly(A) sequence at the 3' end.
B) conversion of normal bases to modified bases,such as inosine and pseudouridine.
C) excision of intervening sequences (introns) .
D) joining of exons.
E) methylation of one or more guanine nucleotides at the 5' end.