In this article we will discuss about the rolling cycle method of DNA replication in φ X 174. All circular genomes do not follow the same pattern of replication described in E. coli. In some bacteriophages (phi, lambda and phi X 174), in mitochondrial chromosomes and during bacterial mating an alternative method known as the rolling circle has been demonstrated. [...]
Some investigators of 1950s focused their attention on viruses containing protein and RNA, but no DNA. The poliomyelitis virus, influenza virus and the virus that causes mosaic disease in tobacco plants (TMV) were thus shown to have genes made of RNA. Earlier in 1935 W. M. Stanley had reported the isolation of a crystalline protein from infected tobacco plants, which [...]
In this article we will discuss about the presence of DNA in mitochondria and chloroplasts. The presence of organelle-specific DNA in mitochondria and chloroplasts was identified with certainty over three decades ago. The occurrence of a specific chloroplast DNA was first demonstrated by Chun et al. in 1963, and of mitochondrial DNA a year later by Luck and Reich (1964). [...]