What is alternative splicing?
A. The phosphorylation events that lead to different types of post-translational regulation
B. mRNA processing events that lead to different types of exons being spliced together
C. folding events that lead to proteins with alternative conformations
D. action by regulatory proteins that leads to changes in the life span of mRNA
E. the splitting of different segments of proteins to produce a completely new protein.

B) mRNA processing events that lead to different types of exons being spliced together

Explanation:

When DNA is transcribed into mRNA, a primary RNA or pre-mRNA transcript is obtained that includes introns and  exons. For this pre-mRNA to give way to an mRNA it must undergo a maturation process of the mRNA, which

is basically to eliminate all introns primary transcript and then binding exons.

So RNA splicing is a post-transcriptional process of maturing RNA from which certain sequential fragments are removed. This process is very common in eukaryotes, and can occur in any type of RNA, although it is more common in mRNA.

Removal of introns and binding of exons in the mRNA occurs before leaving the nucleus. This process is known as splicing. The alternative splicing of identical RNA transcripts into different cell types can produce different molecules of mature mRNA that are translated into different polypeptides.

cuz he is really really short, assuming an unorthodox and inherently unlucky configuration of elevator buttons…

explanation: