Answer
Transcription is the coping of the genetic code form a single-stranded messenger
RNA molecule.(mRNA). The genetic code contains base triplets (exons) that code for amino acids and triplets that do not (introns). Triplets that code for amino acids are called exons; triplets that don't are called introns. Introns are removed during the processing of the mRNA molecule. This occurs after transcription.
Work Step by Step
Processing of the mRNA takes place before it leaves the nucleus:
A cap (a guanine nucleotide) and a tail ( adenosine nucleotides) are added to the mRNA and the the introns are removed . The exons are then brought together and spliced by and enzyme (ribozyme).
