Template strand →polarity 3 ' →5' / code for mRNA
Coding Strand →Polarity 5' - 3' / does not code for anything / all reference point while
defiining a transcription unit is made from it
(b) In the immature / unprocessed RNA the coding / expressed sequence - Exon
Intron- The non-coding unexpressed ( intervening ) sequence in the immature / unprocessed RNA