The incorporation of the cytokinin N(6)-benzyladenine into tobacco (Nicotiana tabacum) callus tRNA and rRNA preparations isolated from tissue grown on medium containing either N(6)-benzyladenine-8-(14)C or N(6)-benzyladenine-8-(14)C: benzene-(3)H(G) has been examined. N(6)-benzyladenine was incorporated into both the tRNA and rRNA preparations as the intact base. Over 90% of the radioactive N(6...