Whereas old dependency theory was Marxist in presentation, but nationalist in orientation, seeking to combine a theory of class struggle with a nationalist âthird worldistâ ideology, the new dependency theory is institutionalist in its analysis and political orientation.
Griffith concluded that the type II-R had been transformed into the lethal III-S strain by a transforming principle that was somehow part of the dead III-S strain bacteria. Today, we know that the transforming principle Griffith observed was the DNA of the III-s strain bacteria. While the bacteria had been killed, the DNA had survived the heating process and was taken up by the II-R strain bacteria. The III-S strain DNA contains the genes that form the protective polysaccharide capsule.
Proof that DNA is Genetic Material Griffith When he added dead, virulent pneumonia bacteria to a mouse, it lived; but if he added dead virulent bacteria to live non-virulent bacteria some mice died. He termed the material that changed the non-virulent bacteria to virulent the transforming principle.hey knew that: DNA-has P but no S Protein-has S but not P They also knew that something from T2 phage entered E. coli cells and directed the bacteria to produce more phage. They assumed that the genetic material was the material that entered the cell.