# Which one of the following statements is not true with reference to the genes of eukaryotic animals?

(1) $RNA$ polymerase allows the transcription of structural genes to synthesize a polycistronic $m-RNA$

(2) Many genes have stretches of notrogen bases that code for amino acids and are called 'exons'

(3) Heterogenous nuclear $RNA \: ( hn\: RNA)$is synthesized from split genes

(4) The bases that do not code for amino acids are called 'introns'