rna often are made of one sequence of nucleotides
rna_molecule is polynucleotide_strand. nucleobase is rna. memory_rna is rna. rna_molecule is rna_strand. rna_strand is polynucleotide_strand. rna_molecule is rna. rna_polymerase is enzyme. rna is polymer. ribosomal_rna_molecule is polynucleotide. rna_enzyme is rna_molecule.