in competition experiments , where additions were made of unlabelled rna prepared from e. coli dna , dna-dependent rna polymerase ( ec 2.7.7.6 ) and nucleoside 5'-triphosphates , the rapidly labelled rna fraction hybridized at a low ( 10:1 ) dna/rna ratio was shown to be competitive with a product from genes other than those responsible for ribosomal rna synthesis and thus was presumably messenger rna .
C0035668
rna
C0035701
ribosomal rna