In this article we will discuss about the meaning of transformation. Transformation is the process of adding a foreign DNA fragment from a donor genome into genome of a recipient cell. The donor fragment passes through the cell membrane of the recipient cell (which may or may not belong to the same species) and becomes incorporated into the latter's genome [...]
In this article we will discuss about the double helix of DNA. On the basis of the evidences available and a knowledge of interatomic distances and bond angles, Watson and Crick proceeded to construct molecular models of DNA. In 1953 they finally postulated a precise, three-dimensional, double helical model which could account for many of the observations on the chemical [...]
In this article we will discuss about the biochemical evidence that genes are made of DNA. Quantitative estimations of DNA carried out on various organisms revealed the following constant features, providing additional support for DNA as the genetic material: 1. The amount of DNA per cell in an organism or a given species is remarkably constant and cannot be altered [...]