examination of one that was resistant to moderate concentrations of streptomycin , ( 25 mug/ml ) and a second that was resistant to high ( 100 mug/ml ) concentrations of streptomycin suggested that both possed ribosomes which had lower affinity for the antibiotic than those of the parent strain , and that tolerance to high levels of streptomycin was due to a resistant ribosomal system for protein biosynthesis .
C0035553
ribosomal
C0597295
protein biosynthesis