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.
Citation: O'Connor, C. (2008) Discovery of DNA as the hereditary material using Streptococcus pneumoniae. Nature Education 1(1) :104. It was a pleasant surprise to the scientific community when clinical research with the bacterium Streptococcus pneumoniae led to the discovery of DNA as the hereditary material.