The virus(from the latin word virus that means toxine or poison) are a parasite biologic entity that are basicly formed of nucleic acid and proteins denominated capsid.The virus prolify by absorbing the DNA of some cells and then the cell die s and the virus multiply.
This things are in the frontier of the live and the nonlive things becouse they dont have metebolism becouse of thi the entibiotics have no effect on this entities.
the viral genoma is very small becouse of this tha virus cant codify many proteins. for resolving this problem the capsid is formed of one or few proteins that are formed on a simetric patern is becouse of this that are two tipes of virus:
Helical virus:in this type the proteins of the capsid are formed in a ciindric form like in the tabaco virus.
Spherical virus:in this type of virus the proteins are formed on a polyhedra form.
Another way to classify the virus is according to the type of genetic material they possess, and hence in this category there are only two types of DNA viruses such as bacteriophages which they feed specifically on bacteria, the adenovirus (that causes colds and pink eye disease), the papillomavirus that causes warts. The other category is made up of RNA viruses or retroviruses such as the influenza, hepatitis, the mosaic of snuff and AIDS.
Not all viruses cause the immediate death of the infected cell, some, such as invading animal cells, the latter converted into factories perpetual virus, so that the cell membrane does not break at the exit of the virus but it only has pores.
Retroviruses possess within its capsid a single strand of RNA and an enzyme called reverse transcriptase or reversotranscriptasa. Once the viral genome has been introduced into the cell, the DNA constructs reversotranscriptasa from the original mold of RNA, this new DNA is incorporated into the cell chromosome. It was then carried out the transcript, generating molecules of viral RNA, reverse transcriptase and proteins of the capsid.
The virus causes a range of diseases in all living organisms. The viral diseases include colds or flu, herpes, measles, varieties of smallpox, hepatitis, AIDS and encephalitis.
Viruses are usually very specific for their hosts and even the types of cells in multicellular organisms that infect. Currently it is suggested that some viruses have changed their accommodation, the human immunodeficiency virus (HIV), of Ebola.
2 comments:
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