Editing of the mRNA begins when a modified adenine base is added to one end of the RNA strand.

Question

Quizplus · Accepted Answer

Editing of mRNA typically involves chemical modifications of the nucleotide bases themselves or the cleavage and joining of RNA segments, not the addition of a modified adenine base to one end of the RNA strand. The addition of a modified guanine nucleotide (the 5' cap) or a string of adenine nucleotides (the poly(A) tail) occurs during RNA processing, not editing.

Editing of the MRNA Begins When a Modified Adenine Base