from the mode of action of ribonuclease ii , which is specific for single-stranded polyribonucleotides and does not attack helical forms , it is inferred that pulse-labelled rna associated with ribosomes of e. coli exists as a single-stranded structure and that ribosomal rna in chloramphenicol particles has a pronounced helical character .
C0035553
ribosomes
C0035701
ribosomal rna