In this article we will discuss about the Nucleus of Controlling Centre of Cell. The protoplast of eukaryotic cell contains prominent spherical or subspherical body called the nucleus (Pl.—nuclei) which controls all the life activities. As a rule, there is only one nucleus in one cell, but there are certain exceptions to this general rule. There may be many nuclei [...]
In this article we will discuss about the subject-matter and structure of Bacteria Cell. Meaning of the Bacteria Cell: The bacteria are unicellular, achlorophyllous prokaryotic micro-organisms leading either saprophytic or parasitic mode of life. An average bacterial cell may measure 1.25 μ in diameter. The smallest among the known bacteria is dialister pneumosintes (0.15 to 0.3 μ in length) and [...]
In this article we will discuss about Viruses:- 1. Meaning of Viruses 2. Sizes and Shapes of Viruses 3. Structure. Meaning of Viruses: Virus is a Latin word which means poison. Adolf Mayer described for the first time a disease of tobacco plant. Dimitri Ivanowski, a Russian botanist in 1892 demonstrated experimentally that sap of mosaic tobacco plant was capable [...]