escherichia coli phage qbeta rna replicase , an rna-dependent rna polymerase ( rna-dependent rna nucleotidyltransferase ) , is a tetramer composed of one phage-coded polypeptide and three host-supplied polypeptides which are known to function in the biosynthesis of proteins in the uninfected host .
C0035685
rna-dependent rna polymerase
C0035673
rna