. Primary transcripts produced by RNA polymerases are generally faithful copies of the DNA template. However, most final/functional forms of these RNAs vary substantially from the primary transcript. Give as many examples as possible of different types of RNA processing. Give an example of an RNA class which is not routinely processed.
I don't know what textbook you are using, however, I would imagine that there is a chapter on RNA processing. I also don't know the level of detail you need.
The major processing events that happen after DNA is copied into RNA are 5' capping, 3' poly-adenylation and splicing.
1) 5' capping: the new RNA molecule is modified by addition of a "cap" that consists of a modified guanine nucleotide. The capping reaction is performed by three enzymes acting in succession: one (a phosphatase) removes one phosphate from the 5 end of the nascent RNA, another (a guanyl transferase) adds a GMP in a reverse linkage (5 to 5 instead of 5 to 3 ), and a third (a methyl transferase) adds a methyl group to the ...