In this article we will discuss about the structure of nucleus. This will also help you to draw the structure and diagram of nucleus. 1. It was discovered by Robert Brown (1831). 2. It is the major part of a eukaryotic cell that contains the genetic material. Prokaryotic cells have no nucleus as such. 3. Each nucleus remains enclosed in [...]
In eukaryotic organisms — plants, animals and fungi — the major portion of DNA is present in the chromosomes which are well-organised structures and quite different from the prokaryotic counterparts. Besides the chromosomes, mitochondria of both plants and animals and the chloroplasts of green plants also contain DNA. Interesting is the fact that the organization and the nature of the [...]
A virus is a pathogenic agent, a infections particle, consisting of a core of nucleic acid (DNA or RNA) enclosed in a protein shell. Viruses are, in general, much smaller than bacteria and have a much smaller genome. But their genetic material is of many varieties, unknown in cellular organisms. Some of these are discussed here. Bacteriophage φX174 which attacks [...]