Our knowlege that DNA is the genetic material has come from the experiments based on the fact that some species of bacteria are capable of naturally taking up dNa from their surrouding medium, and incorprating it into their genomes, by a process called transformation
Our knoelege that DNA is the genetic material has come from the experiments based on the fact that some species of bacteria are capable of naturally taking up DNA from their surrouding medium,and incorprating it into their genomes, by a process called transformation
Fred griffith in the late 1920s first showed that a rough, non-capsulated, avirulent strain of Streptococcus pneumo-niae could be converted into a smooth, capsulated, virulent strain by the addition of heat-killed smooth cells
Fred Griffith in the late 1920s first showed that a rough, non-capsulated, avirulent strain of Streptococcus pneumo-niae could be converted into a smooth, capsulated, virulent strain by the addition of heat-killed smooth cells
Oswald Avery and his group in a series of experiments in the 1930s showed that the material that carried this transforming ability was DNA and not the proteins of the ce
Oswald Avery and his group in a series of experiments in the 1930s showed that the material that carried this transforming ability was DNA and not the proteins of the cell
transformation
transformation
Bacteriophage infection 3s在悬浮液中 35s标记壳体蛋白 放射性同位素在搅拌器中搅拌,离心,检测悬深液\虚 标记的噬菌体 每 与细菌混合,使细菌外的噬菌 和沉淀中的放射性 噬菌体侵染细体与细菌分离 同位素 噬菌体侵染细菌时 仅DNA进入细菌细胞, 而蛋白外壳没有进入 标记DNA 0-2i 新病毒中又检 测到p,没有 在沉淀中 检测到s
Bacteriophage infection