In this article we will discus about the classification of animal viruses. Baltimore (2008) classified the animal viruses in the following seven groups according to the relationships between virion, nucleic acid and mRNA transcription Table (17.1). The RNA within the virion is known as plus (+) or sense strand because it acts as mRNA, whereas the newly synthesized RNA which [...]
In this article we will discuss about the working of immune system in the presence of HIV. Infection is carried out through the spicules present on envelope of HIV which attach to the target cell. The gpl20 has affinity for a specific molecule, the T4 or CD4 molecule exposed on the surface of certain cells i.e. lymphocytes. The lymphocytes secrete [...]
In this article we will discuss about the structure of phage M13. M13 (or f1) phage is a filamentous phage that shows entirely alpha-helical in structure so that the molecule forms a short rod. The helical capsid is simplest measuring about 900 nm long and 9 nm in diameter. M13 is encapsulated in about 2700 copies of the major coat [...]