Introduction of Cell The cell is the basic unit of organization or structure of all living matter. A.G. L Loewy and according to Wilson and Morrison (1966) " an integrated and continuously changing system of the living beings of cells ." And according to John Paul (1970) " the simplest integrated organization in living being systems of the cells, capable of independent survival". Virus es Viruses are very small submicroscopic biological entities which though lack cellular organization possess their own genetic material, genetically determined macromolecular organization, and characteristic mode of inheritance . For their multiplication of viruses, they essentially require the presence of some host cells of the living system, i.e., they are obligate cellular parasites of either bacteria, plants, or animals it means all living beings. Structure Viruses are quite a varied group. They range between 30 to 300 nm or 300 to 3000 Altitude in size, so they can be observe...
Minerals, Protoplasm, Living organisms, Cell and Molecular Biology and its function etc.