RNA editing is when an RNA molecule is changed (edited) through a chemical change in the base make up. There are various types of RNA editing - namely insertions/deletions and switching bases like Cytidine to Uridine or Adenosine to Inosine (properly known as deamination).

RNA editing has been observed in tRNA, rRNA and mRNA (interestingly enough all of them have to do with protein synthesis) of eukaryotes (in the cell nucleus, cytosol, mitochondrion, and chloroplast) but not in prokaryotes - which is interesting because both the mitochondrion and chloroplast are believed to be descended from prokaryotes.

No.

The process which eliminatesintrons is called 'splicing'. This process is mediated by the protein complex called a spliceosome and probably occurs simultaneously with RNA editing. RNA editing is the addition, removal or substitution of bases in an RNA molecule after it has been synthesised, and critically can occur in organisms which lack introns.

There are 3 main types of RNA editing:

1, Addition or removal of Uracil residues. Seen in the primary transcripts in trypanosome mitochondria (does not appear in multicellular organisms).

2, Cytosine -> Uracil Editing. Seen in mRNAs in some animals and plant mitochondria.

3, Adenosine -> Inosine. Seen in animal mRNAs. (Inosine is a very rare base which you get from the deamination of adenosine)

5' processing - capping

3' processing - cleavage and polyadenylation

RNA splicing

RNA editing

The 3 types of RNA are; Transfer RNA (t-RNA), messenger RNA(m-RNA), and ribosomal RNA(r-RNA).