In this article we will discuss about the structure of herpesviruses (explained with diagram). All of them are morphologically identical. They are large with a varying diameter from 140-170 nm. The nucleocapsid is spherical icosahedral and of about 100 nm diameter which is enclosed in a 30 nm thick glycoprotein lipid envelope. Thickness of the envelope indicates for the presence [...]
In this article we will discuss about the structure of picornavirus. Each capsid is composed of 60 copies of four structural proteins of which each proto-meter consists of four polypeptides known as VP1, VP2, VP3 and PV4. VP1-VP3 are exposed on the virion surface, while VP4 lies buried in close association with the RNA core (Fig. 17.21). All the VP [...]
Animal viruses differ from stages in mechanism of entering the host cell. This is due to differences in host cell i.e. one is prokaryotic and the other eukaryotic in nature. It is accomplished into the following stages: 1. Attachment: Animal viruses like bacteriophages posses the attachment sites with the help of which it attaches to the receptor sites present on [...]