Which One of the Following Is Wrong? RNA Splicing

Multiple Choice

Which one of the following is wrong? RNA splicing.

A) is responsible for the joining of V, D, and J segments in formation of a heavy chain immunoglobulin protein.
B) is sometimes an autocatalytic reaction which can occur without added proteins.
C) is often mediated by particles called spliceosomes containing both RNAs and proteins.
D) occurs in the nucleus to form a complete, translatable mRNA with a single open reading frame.
E) often results in the excision of the intron as a structure known as a lariat.